file which includes the original illustrations4 ,see #cieff-;h4htm or #cieff-;h4zip3 7https3_/_/www4gutenberg4org_/cache_/epu b_/#cieff_/pg#cieff-;images4html7 or 7https3_/_/www4gutenberg4org_/files_/#ci eff_/cieff-;h4zip7 ,images of the original pages are available through ,internet ,archive4 ,see http3_/_/archive4org_/details_/curiositi esofhea#jjteff ,illustration3 ,,effect of ,,heat4 ,frontispiece4 ,,curiosities ,,of ,,heat4 by ,,rev4 ,,lyman ,b4 ,,tefft4 ,philadelphia3 ,the ,bible and ,publication ,society1 #ecj ,arch ,street4 ,entered according to ,act of ,congress1 in the year #ahga1 by ,the ,bible and ,publication ,society1 ,in the office of the ,librarian of ,congress1 at ,washington4 ,westcott ,thomson1 ,stereotypers1 ,philada4 ,,contents4 ,,page ,,chapter ,i4 ,,mr4 ,,wilton',s ,,bible ,,class #g ,,chapter ,,ii4 ,,new ,,thoughts ,,for ,,the ,,scholars #bf ,,chapter ,,iii4 ,a ,,difficult ,,question #eh ,,chapter ,,iv4 ,,heat ,a ,,gift ,,of ,,god #hc ,,chapter ,v4 ,,conveyance ,,and ,,varieties ,,of ,,heat #ajj ,,chapter ,,vi4 ,,management ,,and ,,sources ,,of ,,heat #abj ,,chapter ,,vii4 ,,preservation ,,and ,,distribution ,,of ,,heat #aeb ,,chapter ,,viii4 ,,modification ,,of ,,temperature #agf ,,chapter ,,ix4 ,,the ,,ministry ,,of ,,suffering #aij ,,chapter ,x4 ,,transportation ,,of ,,heat #bac ,,chapter ,,xi4 ,,an ,,effective ,,sermon #bcc ,,chapter ,,xii4 ,,transfer ,,of ,,heat ,,in ,,space #bed ,,chapter ,,xiii4 ,,ocean ,,currents ,,and ,,icebergs #bgb ,,chapter ,,xiv4 ,,combustion4--,,coal-,,beds #bib ,,chapter ,,xv4 ,,economy ,,of ,,heat #cje ,,chapter ,,xvi4 ,a ,,day ,,of ,,joy ,,and ,,gladness #cbj ,,curiosities ,,of ,,heat4 ,,chapter ,i4 ,,mr4 ,,wilton',s ,,bible ,,class4 ,the book of ,nature is my ,bible4 ,i agree with old ,cicero3 ,i count ,nature the best guide1 and follow her as if she were a god1 and wish for no other4 ,these were the words of ,mr4 ,hume1 an infidel1 spoken in the village store4 ,it was ,monday evening4 ,by some strange freak1 or led by a divine impulse1 he had determined1 the previous ,sunday afternoon1 to go to church and hear what the minister had to say4 ,so the ,christian people were all surprised to see ,mr4 ,hume walk into their assembly--a thing which had not been seen before in a twelvemonth4 ,mr4 ,hume did not shun the church from a dislike of the minister4 ,he believed ,mr4 ,wilton to be a good man1 and he knew him to be kind and earnest1 well instructed in every kind of knowledge and mighty in the ,scriptures4 ,he kept aloof because he hated the ,bible4 ,he had been instructed in the ,scriptures when a boy1 and many ,bible truths still clung to his memory which he would have been glad to banish4 ,he could not forget those stirring words which have come down to us from the ,lord ,jesus1 and from prophets and apostles1 and they sorely troubled his conscience4 ,he counted the ,bible an enemy1 and determined that he would not believe it4 ,at that time there was an increasing religious interest in the church4 ,mr4 ,wilton had seen many an eye grow tearful as he unfolded the love of ,christ and urged upon his hearers the claims of the exalted ,redeemer4 ,he found an increasing readiness to listen when he talked with the young people of his congregation4 ,the prayer-meetings were filling up1 and becoming more interesting and solemn4 ,the impenitent dropped in to these meetings more frequently than was their wont4 ,mr4 ,wilton himself felt the power of ,christ coming upon him and girding him as if for some great spiritual conflict4 ,his heart was filled with an unspeakable yearning to see sinners converted and ,christ glorified4 ,he seemed to himself to work without fatigue4 ,his sermons came to him as if by inspiration of the ,holy ,spirit4 ,he felt a new sense of his call from ,god to preach the gospel to men1 and spoke as an ambassador of ,christ1 praying men tenderly1 persuadingly1 to be reconciled to ,god1 yet as one that has a right to speak1 and the authority to announce to man the conditions of salvation4 ,a few of the spiritual-minded saw this little cloud rising1 but the people in general knew nothing of it4 ,least of all did ,mr4 ,hume suspect such an undercurrent of religious interest2 yet for some reason1 he hardly knew what1 he felt inclined to go to church4 ,that afternoon the preacher spoke as if his soul were awed1 yet lifted to heavenly heights1 by the presence of ,god and ,christ4 ,reading as his text the words1 ,thou thoughtest that ,i was altogether such an one as thyself 7,ps4 l4 #ba71 he showed1 first1 the false notions which men form of ,god1 and then unfolded1 with great power and pungency1 the ,scripture revelation of the one infinite1 personal1 living1 holy1 just1 and gracious ,jehovah4 ,this was the very theme which ,mr4 ,hume wished most of all not to hear4 ,that very name1 ,jehovah1 of all the names applied to ,god1 was most disagreeable2 it suggested the idea of the living ,god who manifested himself in olden time and wrought wonders before the eyes of men4 ,but the infidel1 with his active mind1 could not help listening1 nor could he loosen his conscience from the grasp of the truth4 ,yet he could fight against it1 and this he did1 determined that he would not believe in such a ,god--a ,god who held him accountable1 and would bring him into judgment in the last great day4 ,in this state of mind he dropped into ,deacon ,gregory's store4 ,deacon ,gregory was accustomed to obey ,paul's injunction to ,timothy3 ,be instant in season1 out of season2 reprove1 rebuke1 exhort with all long suffering and doctrine4 ,having taken ,mr4 ,hume's orders for groceries1 he said1 ,i was glad to see you at church yesterday1 ,mr4 ,hume4 ,how were you interested in the sermon8 ,i like ,mr4 ,wilton1 answered ,mr4 ,hume2 ,i think him a very earnest and good man4 ,but were you not interested and pleased with the discourse8 ,it seems to me that ,i shall never lose the impression of ,god's existence and character which that discourse made upon me4 ,i almost felt that ,mr4 ,wilton spoke from inspiration4 ,i suppose he was inspired just as much as the writers of that book which men call 'the ,bible4' ,but can you wholly get rid of the conviction that the ,bible is the word of ,god1 written by holy men inspired by the ,holy ,spirit8 ,you know1 ,deacon ,gregory1 that ,i do not believe what you profess to believe4 ,the book of ,nature is my ,bible4 ,i agree with old ,cicero3 ,i count ,nature the best guide1 and follow her as if she were a god1 and wish no other4 ,deacon ,gregory had never read ,cicero1 and of course did not attempt to show1 as he might otherwise have done1 that ,cicero did not mean to deny the existence of a living1 personal ,god1 who governs the world4 ,but1 said he1 does not the book of ,nature--your ,bible1 as you call it--have something to say of ,god8 ,does it not speak of an infinitely wise and good ,creator and ,governor8 ,do not the works of ,nature tell of the same ,god whose being and character were preached to us yesterday from the ,holy ,scriptures8 ,nature has never spoken to me of any ,god except herself4 ,what need is there of a creator8 ,who can prove that the universe did not exist from eternity8 ,nature has her laws of development1 and under those laws all the operations of nature go on4 ,you had better read ,darwin4 ,if one must find the character of ,god in nature1 he may as well picture an evil creator and governor as one that is good and righteous4 ,does ,nature punish those whom you call the wicked8 ,does ,nature reward the righteous8 ,do not the laws of ,nature bring suffering to the good and the bad alike1 and happiness also to all classes of men8 ,would you1 if you had power1 create a world like this--a world in which danger1 pain1 and death1 in every shape1 lie in ambush against its inhabitants every hour of their poor existence8 ,but ,i must go4 ,pausing a moment1 however1 as if reluctant to go1 with a voice sad and almost tremulous1 which revealed a great deal more of his heart than he designed to express1 he added3 ,god knows1 deacon1 if there be a ,god1 how ,i wish ,i knew the truth about these matters4 ,the world and myself are to me great and dreadful mysteries4 ',he that will do his will shall know of the doctrine1' answered ,deacon ,gregory2 and inviting him to come to church again1 they separated4 ,this conversation with the pious deacon1 though he had himself done most of the talking and had his say almost unopposed1 did not tend at all to bring rest to ,mr4 ,hume's conscience4 ,he saw that the deacon's faith in ,god did for him more than belief in ,nature and worship at the altar of ,science could do for unbelievers4 ,he felt also that he had spoken a little too freely1 especially in revealing1 at the last1 his unrest of spirit from the want of fixed convictions in regard to religious truth4 ,deacon ,gregory1 by the sincerity and manliness of his address1 was accustomed to draw out the hearts of men so that they expressed them more freely than they designed4 ,upon a bench in a shaded corner of the store sat a lad of sixteen or seventeen years1 unnoticed for the time being by either ,mr4 ,hume or ,deacon ,gregory4 ,his name was ,ansel1 and he was the son of the senior deacon of the church4 ,he was in the village academy1 and had there been nearly fitted for college4 ,he stood at the head of his class1 and1 with his sharp intelligence1 his impetuous energy1 and high ambition1 every one was predicting for him a distinguished life4 ,he had grown up thus far in the bosom of a family where piety was no pretence4 ,earnest prayer had gone up for him by day and by night4 ,he had been well trained in the ,sunday-school1 and for a year had been a member of the small class of young men taught by ,mr4 ,wilton4 ,he had always shown a ready interest in all ,bible studies and a quick understanding of ,scripture doctrine1 so that some thought him not far from the kingdom of ,god4 ,but ,deacon ,arnold little thought what was in the heart of his son4 ,he might have known1 for to read his son's heart he had only to recall his own early manhood4 ,for years he had hung trembling upon the brink of ruin1 swept1 at times1 by his self-will and turbulent youthful passions1 to the very verge of the precipice1 and had been preserved only by singular grace from falling over4 ,now ,ansel was following in his father's early footsteps--self-willed1 and stubborn against the ,spirit of ,god1 and1 at times1 almost persuaded to cast off all religious restraint1 that he might carve out his worldly fortunes untrammeled by religious or conscientious scruples4 ,he had rarely heard infidel sentiments expressed1 but the little that he had heard had attracted him1 and had encouraged him to give loose reins to his own unbelieving disposition4 ,it had not escaped his notice that the two or three men whom he had heard spoken of as infidels were among the most respectable and shrewdest business-men in the village4 ,the idea1 moreover1 of rejecting all authoritative doctrine1 and believing whatever should please him1 carried with it so free and independent an air1 and harmonized so well with his natural disposition1 that he easily drifted in the direction of unbelief4 ,sitting this evening unobserved1 he drank in every word which ,mr4 ,hume uttered4 ,some of the notions thrown out were quite new to him4 ,the book of ,nature my ,bible--,nature reveals no ,god but her own laws--,no proof that the matter of the universe has not existed from eternity uncreated--,nature has her laws of development--,no need of a ,god to govern the world1--these were seed-thoughts in ,ansel's mind4 ,he had before thought of the only alternative to be set over against belief in the sacred ,scriptures as simply unbelief--bare1 blank denial of their truth4 ,he had not dreamed of building up a set of proud1 rationalistic notions1 and denying the truths of religion in the character of a young philosopher4 ,he kept his thoughts to himself1 and turned them over and over in his mind during the week1 and when again he met his pastor in the ,bible class his head was full of his new notions4 ,the lesson went on1 however1 and closed as usual4 ,it so happened that this was the last in a series of lessons upon the ,gospel of ,john4 ,it was necessary1 therefore1 that another course of lessons should be decided upon4 ,mr4 ,wilton proposed the question to the class3 ,what shall be our next course of lessons8 ,would you like to study one of the ,epistles--the ,epistle to the ,romans or that to the ,hebrews8 ,and he briefly stated the subject discussed in these ,epistles of ,paul4 ,perhaps1 he continued1 you would prefer to study one of the historic books of the ,old ,testament8 ,the class had no opinion4 ,they wavered between an ,epistle and a historic book and topical lessons which should confine them to no one book of the ,bible4 ,then ,ansel spoke up3 ,mr4 ,wilton1 why can we not study something which we know to be true8 ,ansel meant to be very cautious as well as very respectful1 and did not design to commit himself by suggesting his own thoughts4 ,he was respectful1 but in the confusion of the moment he had brought out the very thoughts which he meant to conceal4 ,mr4 ,wilton was startled1 though he did not fully understand the drift of ,ansel's question4 ,what do you mean1 ,ansel8 he asked2 do you think ,genesis less trustworthy than the ,epistle of ,paul8 ,ansel saw that he had committed himself and must now make the best of his situation4 ,he therefore answered cautiously3 ,some persons1 ,i have heard said1 do not believe the ,bible to be inspired1 and they say that we have no evidence that it is true4 ,what have you been reading1 ,ansel1 that has put such thoughts into your mind8 ,i have never read a book that said anything against the ,bible4 ,but what did you mean8 ,do you wish to study the evidences of the truth and inspiration of the ,holy ,scriptures8 ,i should indeed like a course of lessons upon that subject1 but that was not quite what ,i was thinking of4 ,what book can you find which is true if the ,bible is not true8 ,i do not know1 sir1 but ,i heard ,mr4 ,hume say that the book of ,nature is his ,bible1 and that we do not need any other1 and that1 whether the ,bible be true or not1 we know that the teachings of ,nature must be true4 ,but we should find1 said ,mr4 ,wilton1 that the teachings of ,nature and the ,bible would perfectly agree4 ,did ,mr4 ,hume say that what he calls ',the book of ,nature' contradicts the sacred ,scriptures8 ,now that ,ansel could give the thoughts which filled his mind1 not as his own1 but as ,mr4 ,hume's1 he showed no farther hesitation in speaking4 ,yes1 sir1 he answered2 he said that ,nature teaches us that there is no ,god1 because there is no need of any4 ,he said that we cannot prove that ,god created the universe1 but that matter has existed from eternity uncreated1 and that all the changes in nature go on by certain laws of development1 and that a certain ,mr4 ,darwin had written a book and proved this4 ,the reader will notice that in the report of ,mr4 ,hume's language the scholar went somewhat farther than his master had done4 ,mr4 ,wilton was well acquainted with the present shape of scientific infidelity1 and saw that ,ansel's statements were somewhat exaggerated1 but he understood in a moment the drift of ,ansel's thoughts1 though he could not tell as yet how deep and fixed an impression had been made upon his mind4 ,but he did not care to probe ,ansel's conscience just then and there1 in order to learn the exact state of the case4 ,if ,i understand you1 then1 he said1 you would like a course of lessons in the teachings of ,nature8 ,of course1 ,i did not suppose that you would allow us to have a course of lessons in the works of ,nature instead of the ,bible4 ,but if ,i were willing to give you a course of lessons showing the footprints of the ,creator1 so to speak1 in the physical world1 how would it please you8 ,i should like it very much4 ,how would such a plan please the other members of the class8 ,the idea was entirely new2 no one of them had ever dreamed of studying in a ,bible class anything except the ,bible2 but young people are not averse to novelties1 and they readily gave their assent4 ,yet ,i should do the class injustice by leaving the impression that they were influenced simply by the love of something new4 ,they were of just that age when one hardly knows whether to call them lads or young men2 they had been well instructed1 and were just beginning to think independently4 ,they were rapidly becoming conscious of their own mental power1 and were eager to try their strength upon every line of thought4 ,their own weakness they had hardly begun to learn4 ,perhaps they were all the more ready to undertake such a course of study because they knew nothing of the difficulties attending it4 ,the tinkling of the superintendent's bell warned them to close their conversation4 ,we have not time to-day1 said ,mr4 ,wilton1 to fix on the particular line of study which we shall follow4 ,of course we cannot examine all the works of ,nature1 and study every science1 and trace the footprints of the ,creator in every place where he has walked2 we must fix on some small part of the works of ,god1 and direct our attention closely to that4 ,we shall find this course more profitable than roaming carelessly over a much larger space4 ,our next lesson will have to be a general one--a kind of preface to what shall come after4 ,in the mean while1 you can be collecting your thoughts upon the subject1 and calling to mind anything that you have read bearing upon the handiwork of ,god manifest in ,nature4 ,the school closed1 and as the scholars pass out let me introduce to you the members of the pastor's class4 ,this class was small for several reasons4 ,the church to which ,mr4 ,wilton preached was not the popular church4 ,the fashionable people and all who loved popularity and drifted with the tide went to another church4 ,careless1 thoughtless young people naturally went with the crowd1 and of those who attended his church some did not care to join his class4 ,he was too much in earnest to please them4 ,he made religion a reality1 and his instruction compelled them to think1 and of course those who did not like to think were not well pleased with him4 ,but there were a few of the young men who were greatly interested in his instructions4 ,they were earnest readers of instructive books2 they liked conversation which called out thought2 they were most of all pleased with questions and themes which gave them new ideas4 ,indeed1 in the community1 there were two classes of persons who held ,mr4 ,wilton in the highest esteem and regard3 one of these was composed of men and women of earnest1 intelligent piety1 experienced ,christians2 the other1 of those who were not ,christians1 but who respected sincerity and disinterested godliness1 and liked sermons filled with meat and marrow4 ,thus1 at the present time1 we find his class composed of but three young men4 ,with ,ansel you are already acquainted4 ,the second is ,peter ,thornton1 the son of a master-carpenter4 ,he was frank1 outspoken1 quick in the acquisition of almost every kind of knowledge1 but very little given to silent reflection4 ,he listened to his pastor's instruction as he would go to a well-filled library1 to draw out its stores of information4 ,morals and moralizing he did not like4 ,he was not pious1 and gave no indication of serious impressions4 ,the third was ,samuel ,ledyard1 the son of a poor widow4 ,by painful industry and economy his pious mother was giving him the best advantages for education which the village afforded1 praying the ,lord to give him a part in the blessed work of preaching the gospel and winning sinners to ,christ and salvation4 ,when but twelve years of age he gave himself to ,christ1 and had been trying faithfully to follow his ,lord4 ,the long winter evenings were spent in reading books of history and science--books fitted to furnish and strengthen his mind--and long ere the light dimmed the morning star he was poring over his ,bible1 alternately reading the word and praying that his mind might be opened to understand the truth in its beauty and greatness1 and that the truth might be wrought in him by vital experiences4 ,with such habits it was no wonder that he grew in grace--it was no wonder that he grew in all manly qualities4 ,he was silent1 meditative1 and retiring1 as gentle in his ways as a quiet girl1 yet all who knew him recognized in him a singular weight and worth of character4 ,those to whom the ,lord revealed his secrets began to say that ,samuel was appointed of ,god to preach the gospel1 and his mother felt the assurance growing strong in her heart that her prayer was granted1 and that the ,lord was preparing her only son and only child for a place in the gospel ministry4 ,if only she might train up a son to such a work1 and when she should go to her rest leave in her place a man working for ,christ in his harvest-field1 gathering sheaves unto everlasting life1 she felt that her cup would be full4 ,she was ready to say with ,simeon3 ,now lettest thou thy servant depart in peace1 for mine eyes have seen thy salvation4 ,how unlike she was to those mothers who lay all hindrances in the way of their sons entering the work of the ,christian ministry1 willing that they should do anything but this6 and how different from those who declare that their daughters shall never wed ministers of the gospel1 teaching them to despise the service of a pastor's wife6 ,how often ,god gives over such sons and daughters--children consecrated from their birth to worldliness--to be entangled and lost in worldly snares6 ,as such mothers sow1 thus also do they reap4 ,these were the three lads1 just growing into young manhood1 at this time under the instruction of ,mr4 ,wilton4 ,he was not ashamed of his class1 though it was small4 ,as he saw them expanding in thought and taking shape under his hand1 he felt that in them he was perpetuating his influence in coming generations4 ,he believed that in one or more of them he should preach the gospel after his body was sleeping in the earth awaiting the resurrection4 ,i trust the kind reader will be interested in following the course of study through which their pastor shall lead them4 ,,chapter ,,ii4 ,,new ,,thoughts ,,for ,,the ,,scholars4 ,the little class which has been introduced to the reader came together the next ,lord's ,day interested and expectant1 yet not knowing what to expect4 ,they had chosen a course of study1 yet they could not tell what that course was to be4 ,they had tried to think of something definite about it1 but could fix their minds upon nothing4 ,in fact1 the whole subject was new1 and they could not decide where or how to take hold of it4 ,they came together1 therefore1 with no more knowledge of the subject than when they separated4 ,mr4 ,wilton himself came before his class in a state of doubt4 ,he had given the subject many hours of thought1 and had carried it to his closet and besought the guidance of the ,holy ,spirit1 for he believed the divine ,spirit to be the best guide in understanding the works as well as the word of ,god4 ,he felt that his prayer had been heard and answered4 ,he was prepared1 therefore1 to speak with the force of clear understanding and positive convictions4 ,but the precise line of study he had left to be determined by circumstances1 perhaps by the previous studies of his class in their academic course4 ,this was to be decided by further consultation4 ,since no lesson was assigned upon which you could prepare yourselves1 ,mr4 ,wilton said1 after the opening exercises of the school were finished1 ,i shall spend the half hour to-day in a kind of conversational lecture4 ,you may call this the preface or introduction to the lessons which will follow4 ,i shall try to make plain some general principles which we must keep in mind1 whatever department of ,god's works we shall attempt to examine4 ,i wish you to feel entirely free to interrupt me at any time1 and ask any question or present any objection which may strike your minds4 ,we must1 if possible1 have no prowling bands of enemies in the rear4 ,i wish to make everything as plain as the case will admit4 ,one thing let me remind you of in the beginning3 ,i shall not try to prove to you that there is a ,god4 ,i shall not try to prove that the world had a creator4 ,there are some things which men do not believe merely on account of good evidence1 nor disbelieve for want of proof4 ,men believe in their own existence1 but not from a course of argument4 ,most men believe in the real existence of the outward world--the earth1 the hills1 the rivers1 the trees1 everything which we see and hear and feel--but not on account of proof4 ,here and there a strange man is found who professes to disbelieve the real existence of all material things1 but he disbelieves not for want of proof4 ,men believe that their sight and hearing and touch do not deceive them1 but their confidence in them is not the result of a course of reasoning4 ,to believe in our own existence1 and in the existence of the world outside of us1 and in the truthfulness of our senses1 is natural2 to disbelieve these things is unnatural3 it shows a state of disordered mental action4 ,when such disbelief is not practically corrected by a man's understanding he is counted insane1 and is treated accordingly4 ,belief in the existence of ,god is also a natural belief4 ,a denial of ,god's existence shows1 not disordered mental action1 but a disordered moral and spiritual state4 ,it shows the absence of that spiritual faculty by which we receive spiritual impressions1 and are brought into contact with the spiritual world1 and hold intercourse with ,god and ,christ and the ,holy ,spirit4 ,men must be convinced of the existence of ,god through their conscience1 their moral and spiritual nature4 ,do not misunderstand me4 ,i do not say that good evidence cannot be brought to prove to one's reason the existence of ,god1 but ,god has not left his existence to be proved3 he has revealed himself to men's consciences and to their faith2 and those in whom conscience and faith are well developed1 sound1 and right do not need an elaborate argument to prove the divine existence4 ,i shall simply try to show that the works of creation exhibit the wisdom and goodness of ,god4 ,if any man1 looking at such indications of wisdom and kindness1 can believe that it all comes by chance or is the work of some evil agency1 and that no ,being of boundless intelligence1 wisdom1 power1 and goodness has anything to do with the making and governing the world1 he certainly shows great prejudice3 he does not want to recognize ,god's existence4 ,he must be one of those spoken of by the ,psalmist who say1 'no ,god4' ,during my recent visit to ,greenville ,i visited a mill1 the largest of its kind in the country4 ,in one room was a machine1 something like a huge straw-cutter1 working with great power4 ,in another room was a large steam boiler hung upon a shaft and made slowly to revolve while filled with steam4 ,in a third room were large oval tanks1 or cisterns1 which might be filled with water4 ,across each tank was a heavy shaft carrying a drum set with steel blades1 and as the drum revolved these blades passed other blades in the bottom of the tank1 cutting whatever came between like scissors4 ,in a fourth room were certain long and complicated machines4 ,each machine was composed mostly of rollers4 ,there were large rollers and small rollers1 solid rollers of enormous weight1 and hollow rollers to be heated by steam within4 ,over and around a portion of these rollers passed a broad wirecloth belt4 ,over others passed a like belt of felted cloth4 ,with these machines before you1 could you tell me whether the inventor were a wise and skillful machinist8 ,how could we tell1 asked ,peter1 without knowing what kind of work the machine was designed to do8 ,you could not tell1 answered ,mr4 ,wilton2 you would need to know both what the machine was designed to do and all the processes by which the work was to be carried on4 ,this brings out the first point which ,i wish you to fix in mind4 ,it is this3 ,to judge of the wisdom of any contrivance1 we must understand the purpose1 or object1 which the inventor had in view2 we must understand the work to be accomplished1 and also the difficulties to be overcome4 ,an ordinary locomotive steam-engine is admirably fitted to run on iron rails1 but he would be a foolish man who should purchase such an engine to draw a train of loaded wagons over a common road of earth4 ,on such a road it could not even move itself4 ,it is good for that for which it was made1 and for nothing else4 ,how would you apply this principle to the subject we are now considering8 ,you may answer1 ,samuel4 ,i think you mean1 said ,samuel1 that1 in order to judge of the wisdom and goodness of ,god in creating and governing this world1 we must know the object he had in view in making such a world4 ,that is my meaning1 and ,i am glad that you understand me so perfectly4 ,if this world were created with no other object than to be the grazing-field for herds of cattle1 which see no difference between the beauty of the violet and the dull shapelessness of the cold earth upon which it grows1 and never lift their eyes above the horizon1 then all the beauty of earth and sky would be useless2 there would be no wisdom or goodness in the creation of this beauty4 ,there would be no wisdom or goodness in laying up in store beds of coal1 buried deep beneath the surface of the earth1 if ,god designed the world to be inhabited only by savages too rude and ignorant ever to mine it1 and turn it to some practical use4 ,but let me give you another illustration1 which can better be applied to the condition of things in this world4 ,just in the outskirts of one of our inland cities ,i once saw a large and elegant building1 whether a private dwelling or a public institution ,i could not at first tell4 ,it stood high and airy1 commanding the most pleasing prospect that all the region presented4 ,we will follow a visitor as he goes to examine that noble establishment4 ,as he comes nearer1 he sees that the edifice is simple and classic in its style and chaste in its architectural adornment4 ,it is a pleasure for the eye to rest upon its graceful symmetry4 ,but in place of the light and graceful fence which he expects to find enclosing its grounds1 he sees a stockade strong and high4 ,the janitor turns the heavy key1 the rusty bolt flies back1 and the visitor enters the enclosure4 ,within the stockade he finds a portion of the ground laid out with taste and cultivated with choice and beautiful flowers2 another part is devoted to the culture of garden vegetables4 ,he finds workshops also for the manufacture of pails and tubs1 brooms and mattresses4 ,the visitor is ushered into the mansion itself4 ,he finds everything more than comfortable2 the rooms are heated from furnaces below2 every part is perfectly ventilated2 the windows command a view of the country around which must please the most cultivated eye2 a school-room is provided with all needed apparatus for the most thorough instruction4 ',surely1' says the visitor1 'the founder of this institution must have been both wise and good4 ,he must have loved the young in order to study and supply all their needs so completely4' ,but some things strike the visitor painfully4 ,the windows are grated with iron1 and some of the rooms are almost like prison cells4 ',can it be possible1' he thinks within himself1 'that the young need to be confined by a stockade in so pleasant a place and shut in by grates of iron for the enjoyment of such advantages8' ,the master as he teaches his pupils seems as kind and gentle as a mother1 yet there is a firmness and authority in his tones and a rigidity in his training1 as if his government were kept braced against a mutinous spirit4 ,the means of punishment also are provided1 and1 when occasion requires1 stern chastisement is employed4 ,all this seems to the visitor like an enigma4 ,the institution appears to him like a bundle of contradictions4 ,a father could not have provided a pleasanter home or larger advantages for his children1 but fathers do not commonly surround their homes with stockades1 and cover their windows with bars of iron1 and train their obedient children with a hand of such firm1 unyielding force4 ',pray1 sir1' he says to the master1 'what is this strange contradictory institution8' ',it is the ,state ,reform ,school1' the master answers4 ',and who are these lads and young men for whom all this work and wisdom is expended8' ',they are those who have taken the first steps in crime1 but have not as yet become hardened and fixed in wickedness1 and are sent here with the hope of overcoming their vicious propensities and training them to virtue and an honorable manhood4' ,everything is now made plain4 ,the need of the stockade1 and the grated windows1 and the rigid government1 as well as of the pure air1 the garniture of beauty1 and the kind loving care1 is manifest4 ,it is a place unsuited to a family of obedient children1 and equally unsuitable as a place of confinement for confirmed criminals1 shut up1 not for reform1 but for punishment4 ,it is wisely adapted to the work designed to be accomplished1 and to no other4 ,in like manner1 if we would judge of the wisdom and goodness of ,god in the creation and government of this world1 we must understand the use for which the world was designed4 ,is this plain to you1 ,ansel1 and does it seem reasonable8 ,yes1 sir2 ,i think ,i understand it1 and ,i can see no objection to the principle4 ,i think even ,mr4 ,hume could find no fault with that4 ,but how shall we know the object for which ,god made and governs the world8 ,that is the next point to be considered4 ,perhaps you will tell us what seems to you to be that object8 ,young people sometimes have thoughts and opinions upon the greatest questions4 ,i have never formed an opinion of my own1 ,ansel replied1 but ,i have always heard it said that ,god designed to show how perfect and good and beautiful a world he could make4 ,but many things in the world seem to me neither perfect1 nor good1 nor beautiful4 ,why1 ,ansel6 exclaimed ,samuel2 the ,bible says that ',god saw everything that he had made1 and behold it was very good4' ,and1 ,mr4 ,wilton1 asked ,peter1 does not the ,bible say that ',god created all things for his own glory'8 ,before answering any of these questions1 let me ask ,samuel a question4 ,what do you understand to be the meaning of the words you quoted from the last verse of the first chapter of ,genesis8--',god saw everything that he had made1 and behold it was very good4' ,i suppose it means1 answered ,samuel1 that ,god made everything just as good and beautiful as it can be1 so that any change must be a change for the worse4 ,the lecturer last winter said that if men could entirely destroy any one of the most troublesome species of insects1 their destruction would be a great loss to the world1 and that if a single atom of matter belonging to the earth were annihilated1 it might throw the solar system out of balance1 so that it would finally be destroyed4 ,i remember1 said ,mr4 ,wilton1 that some lecturer last winter made statements of that kind1 and ,i have heard other people declare that the least possible change in the world would be injurious1 if not destructive1 to the interests of man1 and that the most troublesome beasts and insects and the most loathsome reptiles are necessary to human happiness4 ,does that seem to you to be true1 ,samuel8 ,i have always tried to believe it1 because ,i thought ,i ought to believe it4 ,it has seemed to me to be dishonoring ,god to believe that he did not make the best possible world4 ,you are right in trying to believe what seems to be right and true1 even though difficulties do lie in the way4 ,difficulties do not by any means show that an opinion is false4 ,we must certainly believe that ,god made this world perfect for the object which he had in view in making it4 ,but not a few skeptics deny the existence of a good1 wise1 righteous ,creator and ,governor1 because they have a wrong idea of the end for which the world was created1 and1 consequently1 a wrong idea of that in which its perfection must consist4 ,let me ask you a few questions which will lead your minds in the right direction4 ,do not men produce by cultivation better fruits and vegetables than ,nature ever grows when left to herself8 ,yes1 sir1 said ,ansel2 the peach and apple and potato have been brought up to their present state of excellence by great care and exertion4 ,originally1 they were almost worthless4 ,and not only that1 said ,mr4 ,wilton1 but when once that careful culture is relaxed they begin to return to their former badness4 ,again1 do we not improve upon ,nature by drainage and improve upon the climate by irrigation8--in fact1 do not men by drainage and irrigation and all manner of culture greatly improve the natural climate of a country8 ,i think that is true1 said ,ansel4 ,i never thought of that before1 said ,peter4 ,moreover1 do you not suppose that heaven will be more beautiful than the earth1 and that a thousand troublesome things besides sin--loathsome sights1 discordant and jarring noises1 disgusting and nauseous odors--will be absent from that 'better land'8 ,and ,i never thought of that before1 said ,samuel4 ,i am sure that many unpleasant things besides those which sin has brought into the world will not be found in heaven4 ,i see that this world might be changed and not be made worse for holy beings to live in4 ,the world is very good1 said ,mr4 ,wilton1 for the purpose for which it was created1 but we need not look upon it as designed for a specimen of the most beautiful1 pleasant1 and desirable world which the ,creator could produce4 ,but you have not told us1 said ,peter1 what the ,bible means when it says that ,god created all things for his own glory4 ,does it not mean that he made the world so good and perfect that all creatures ought to praise him on account of it8 ,we ought1 said ,mr4 ,wilton1 to praise ,god for the wisdom and goodness displayed in the works of creation4 ,that is the teaching of the ,bible in many places2 it is also the sentiment of the ,bible that ,god created the world and carries on all things for his own glory1 but it nowhere uses the exact language which you have employed4 ,in ,isa4 xliii4 #g1 speaking of 'every one that is called by my name1' the ,lord says1 ',i have created him for my glory4' ,in ,prov4 xvi4 #d it is written1 ',the ,lord hath made all things for himself2 yea1 even the wicked for the day of evil2' and the four and twenty elders fell before the throne of ,god saying3 ',thou art worthy1 ,o ,lord1 to receive glory and honor and power2 for thou hast created all things1 and for thy pleasure they are'--that is1 exist--'and were created4' ,i might quote other texts of similar meaning4 ,we are taught also that our first and supreme aim in all our conduct should be the glory of ,god4 ',whatever ye do1 do it all to the glory of ,god4' ,but here two questions arise3 ,what is the glory of ,god8 and1 ,what is it for ,god to glorify himself by his works of creation and government8 ,who will tell us8 ,all were silent1 and ,mr4 ,wilton went on speaking3 ,the word glory means1 first and literally1 a halo of light4 ,the glory of ,god is the radiance1 or halo1 so to speak1 of his infinite attributes and holy character4 ,god glorifies himself when he reveals himself1 and makes known his character1 and causes the uncreated splendor of his attributes to break forth1 so that his creatures recognize them and adore him4 ,this1 you see1 is very different from the idea of glory among ambitious men4 ,god glorified himself in the creation of the physical world1 because from that creation his wisdom1 power1 and goodness are manifest4 ,he glorified himself in the creation of angels and men1 because they were created in the image of ,god and are finite pictures1 so to speak1 of the infinite ,creator--a revelation of his spiritual being and personality4 ,he glorifies himself in his government of the world1 because his administration of affairs exhibits his justice1 mercy1 and holiness4 ,this is what we mean by the glory of ,god and his working all things for his own glory4 ,this is somewhat difficult for persons of your age1 so we will leave it and return to the exact subject of discussion4 ,admitting that ,god created the world and governs it for his own glory--that is1 to reveal himself--for what specific purpose did he design this earth8 ,i don't know1 said ,peter1 that we understand what you mean by 'specific purpose4' ,very well1 then1 said ,mr4 ,wilton2 ,i will suggest the answer4 ,does the world seem as if fitted up to be the dwelling-place of holy beings8 ,i have never thought of the question before1 said ,ansel2 but it seems to me that many things in this world would give pain even to angels if they lived here with bodies like ours4 ,i agree with you1 ,ansel4 ,if men were sinless and holy as the angels of heaven1 many things in this world would bring them distress4 ,but does it seem reasonable that the world was designed merely as a place of punishment for men by reason of their wickedness8 ,some men are not wicked1 replied ,samuel4 ,there have always been men willing to die rather than disobey ,god4 ,surely1 ,god does not punish such men4 ,and many beautiful and pleasant things are found in the world--arrangements plainly designed for the welfare and happiness of men4 ,i think you are right1 ,samuel4 ,but1 without asking further questions1 ,i will give you the conclusions to which my study upon this subject has brought me1 and some of the reasons for those conclusions4 ,this world was made chiefly as the dwelling-place of man4 ,the world was not planned merely as the abode of brute animals4 ,men are nobler than the brutes4 ,men have permanent interests and advantages4 ,aside from the glory of ,god1 men are an end unto themselves4 ,to become and be men is the noblest object of human life1 but the animal tribes exist for the use and benefit of others4 ,to be an end to itself1 a creature must be immortal2 but the brutes exist for the use and advantage of man1 live out their transient life1 and exist no more4 ,this is the view presented in the sacred ,scriptures4 ,god gave to man lordship over the earth--not only over the soil to subdue it1 and over the great forces of ,nature to bring them into subjection for human advantage1 but also over the brute creation1 'over the fish of the sea1 the fowls of the air1 and every living thing that moveth upon the earth4' ,i conclude also that ,god did not prepare this world as a prison-house and place of punishment for rebels against his government4 ,too many pleasant things abound for me to believe that4 ,the pleasant breezy air1 the glorious sunlight1 the refreshing showers1 the treasures of mineral wealth stored up in the earth1 the fertile land and golden wheat1 the beauty spread over all nature1 the sweet consciousness of existence1 so that just to live and act is joy1 and the comfort and hope of immortal pleasure enjoyed by truly ,christian men1--all these things1 and many more1 assure me that not the subtle shrewdness of a tormentor nor the unmingled justice of an inexorable judge1 but the heart of a kind and loving ,father1 planned our earthly dwelling-place4 ,you said1 ,samuel1 with truth1 that there are many pious men in the world who are dear to ,god1 and ,paul says1 ',we know that all things work together for good to them that love ,god4' ,for those dear ones ,christ has such love that he counts everything--whether good or bad--that is done to them as if done to himself4 ',inasmuch1' he says1 'as ye have done it unto one of the least of these my brethren1 ye have done it unto me4' ,moreover1 ,jesus said3 ',for ,god so loved the world1 that he sent his only begotten ,son1 that whosoever believeth in him should not perish1 but have everlasting life4' ,from these words of ,jesus we see that there is love manifested in the dealings of ,god with the inhabitants of our world4 ,were it not so1 there would nothing remain but a 'fearful looking-for of judgment and fiery indignation1 which shall devour the adversaries4' ,on the other hand1 ,i conclude that ,god made the world as the dwelling-place1 not of obedient1 holy children1 but of those who are disobedient1 fallen1 and alienated4 ,these disobedient and alienated ones he holds under discipline and chastisement1 in order to keep their wickedness in check1 to recover them from their sins1 and train them up in virtue and holiness1 or to remove from the obstinate and incorrigible all excuse for their sins and all plea against their final condemnation4 ,in doing this he glorifies himself by manifesting his wisdom1 goodness1 mercy1 and holiness4 ,this opinion seems probable from the fact that this is the purpose for which ,god has actually used and is now using the world4 ,here he keeps and governs the human race4 ,this race is made up neither of holy beings nor of hopeless reprobates4 ,they are the creatures of ,god2 fallen indeed1 yet loved2 sinful1 but objects of divine compassion2 deserving of righteous wrath1 but the recipients of the offers of salvation through ,christ4 ,even penitent believers in ,christ and devoted servants of ,god are not free from evil propensities1 but need to be kept under constant training and discipline4 ,this is the use to which the ,creator has actually put the world4 ,is it not reasonable to believe that he designed it for their use8 ,ought we to believe that ,god planned the world for an object for which it never has been and never will be employed8 ,if sin were removed from the world1 the chief part of human suffering would be removed4 ,this no man can deny4 ,wars would cease2 the want1 disease1 and woe resulting from selfishness1 idleness1 and vice would disappear1 and nothing would stand between man and his ,maker4 ,what new life and joy would fill the world if free communication were restored between man and ,god1 and the divine smile were again to enlighten the world6 ,it would seem that heaven had enlarged her borders to embrace this earthly ball4 ,but the fact would still remain that this physical world is unfitted to be the dwelling-place of sinless beings4 ,the constitution of the world would bring upon them pains and evils which would seem a most unworthy heritage for loving and obedient children of our heavenly ,father4 ,let sin be taken away1 and wearisome toil in subduing the earth would remain4 ,the soil of the earth is hard and clogged with stones1 and clammy with stagnant waters1 and sown well with the seeds of noxious weeds1 and overgrown with thorns and thistles4 ,endless watchfulness and toil is the price of a livelihood4 ,with the sweat of his face man must eat his bread4 ,an army of enemies have pre-empted the soil which man must till4 ,this state of things the word of ,god refers to sin3 ',cursed is the ground for thy sake2 in sorrow shalt thou eat of it all the days of thy life4 ,thorns also and thistles shall it bring forth to thee4' ,the necessity of toiling as we do now for our daily bread1 ,god denounced upon man as a curse on account of sin4 ,we cannot1 therefore1 regard this as a suitable condition for sinless beings4 ,this burden of toil is lightened by the progress of modern sciences and inventions much less than some men think4 ,every step of progress has been made by the sacrifice of hecatombs of human lives4 ,from our laboratories and workshops products of human skill1 rich and rare1 are sent forth2 but what are they but smelted and hammered and graven and woven human bones and sinews1 the health and life of men8 ,no means have been discovered by which the most necessary processes of the arts can be made otherwise than dangerous to health4 ,only when thousands of miserable workmen had perished was ,sir ,humphrey ,davy's safety-lamp invented2 and now the danger1 to say nothing of the hard toil1 of the collier's life is only lessened1 but not removed4 ,still1 our furnaces roar and the whole tide of civilization goes on by the health-destroying servitude of men1 buried alive as it were in the dark bosom of the earth4 ,would that seem to be a fitting employment for the sinless children of the all-loving ,father8 ,employes in many kinds of manufacture slowly sink under the accumulated evils of daily toil1 and no means of making their employments healthful have been discovered4 ,the friction-match1 which has become so nearly a necessity1 is made by a process so destructive to health that only a certain class of laborers can be prevailed upon to do the work4 ,i might go on to speak of other painful circumstances in which men find themselves by the almost antagonistic attitude of ,nature4 ,but if we reject these dangerous processes of manufacture and art1 we go back at once to the wooden plough1 the distaff and tinder-box of primitive times1 and also to primitive poverty and primitive toil1 and1 ,i may also add1 to primitive exposure to the hostile and pitiless forces and inclemencies of ,nature4 ,purge the earth of sin1 and wearisome toil would still remain4 ,nature must be nursed and cultivated or she yields no bread4 ,her hostile attitude must be overcome2 the thorns and thistles must be rooted out2 and every step of progress1 won by suffering1 must be held by painful work and watchfulness2 otherwise ,nature returns to the wild and savage state4 ,relax the culture of the choicest fruit1 and it begins to deteriorate2 leave the best-blooded breed of cattle to itself1 and it returns again to the level of native1 uncultured stock4 ,the inhabitants of this world are also liable at all times to diseases and destructive accidents4 ,this condition of things could not be changed without changing the entire structure and plan of the world4 ,is that a fit dwelling-place for a sinless being where chilling winds one day shrivel his skin and fill his bones with rheumatic pains1 and the next1 sweltering heats pervade all his system with languid lassitude--where miasma lies in wait unseen to poison his blood1 kindle the malignant fever1 and bring him to the shades of death1 and every form of accident crouches in ambush1 ready to spring upon his victim unawares and tear him limb from limb8 ,we cannot see that the absence of sin would dissipate this liability to disease and the danger of accidents4 ,nay1 this liability and danger are written upon the very constitution of the human body4 ,the finger of ,god has engraved it upon every muscle and bone and life-cell4 ,the ,creator gave the body that wonderful power called the vis medicatrix--the power of recovering from injuries and repairing damage done to itself4 ,pull a leg from a grasshopper and another grows in its place4 ,by this we know that the ,creator understood the liability of this little insect to lose a limb1 and prepared him for it4 ,in like manner the power in man's body to heal a wound or join a broken bone gives us to understand that the ,creator expected man to live in the midst of danger4 ,the precaution proves the risk4 ,these accidents are such as no possible carefulness could guard against4 ,to say nothing of the fact that all our knowledge of these perils comes from a painful experience of danger and death1 what care1 even after ages of sad experience1 could ward off the thunderbolt8 ,what carefulness could guard against the tornado on the land1 or the hurricane and the cyclone upon the sea8 ,who should stand sentinel against the unseen poison borne upon the wings of the wind8 ,what power should save him from the bursting of the volcano and the jaws of the earthquake8 ,what care could give him knowledge of the qualities of all natural substances1 that he might avoid their dangerous properties8 ,we can suppose a divine care over man that should do all this and save men from harm1 but it would be a providence superseding all human knowledge and exertion--it must be a providence to which the human race is now a stranger2 miracles would then be the rule1 and the undisturbed course of ,nature the exception4 ,if1 however1 we suppose that ,god designed the world as a training-school1 so to speak1 of fallen beings1 such as the word of ,god declares the human race to be1 all is plain1 everything is suitable and harmonious4 ,we can see the fitness of at least the chief outlines of man's earthly condition1 and can perceive ,god's wisdom and goodness in the constitution of the world4 ,the pain and woe-producing agencies of ,nature are seen to be not at all contradictory to goodness1 but on the other hand eminently wise and righteous4 ,the whole sum of human misery expresses ,god's displeasure at sin4 ,by their sufferings men learn how abhorrent is sin in ,god's sight4 ,by the consequences of evil-doing they learn not to transgress4 ,as none are free from the taint of depravity1 none are free from pains4 ,the necessity of labor--one of the elements of the primal curse--is a check to sin on the part of the vicious1 and a discipline and trial to virtue on the part of the penitent4 ,the multiform trials of life--which can indeed be borne well only by the grace of ,god--while they teach the evil of sin and keep the heart chastened and subdued1 nourish heroic and dauntless virtue in the faithful4 ',daily cares' become 'a heavenly discipline4' ,dangers and calamities startle the stupid conscience1 and keep alive the sense of responsibility to ,god on the part of the wicked2 they quicken the sense of weakness and dependence in the believing and educate their faith in ,god4 ,the more sudden and overwhelming these evils1 and the more these dangers are placed beyond the possibility of being warded off by human care1 the more do they awaken in men a sense of the divine presence and of responsibility to ,god4 ,but would not all these natural agencies subserve essentially the same ends in the discipline of unfallen and sinless beings8 ,by no means4 ,if sufferings came upon a sinless being1 he could not feel that they came as chastisements2 he could not feel them to be deserved4 ,they would be to him a 'curse causeless1' and hence would bring no advantage4 ,he could only cry out in astonishment1 ',father1 why am ,i1 thine obedient son1 thus smitten8' ,calamity falling upon the innocent would be an anomaly in the universe4 ,but now the sufferer1 pierced through and through with a sense of ill desert1 meekly bows his head1 murmuring1 ',father1 all thy judgments are just and right4' ,one very important feature of the world we live in is its moral symbolism4 ,the world is full of most suggestive symbols and emblems of moral good and evil4 ,there are all beautiful and glorious things1 to stand as types of goodness1 truth1 and righteousness2 there are all loathsome1 malignant1 and hideous things1 to serve as the types of folly and wickedness4 ,was it merely an accident that the dove was fitted to become the emblem of purity and of the ,holy ,spirit8 the lamb1 to be the emblem of gentleness1 of ,christ the gentle ,sufferer1 and of his suffering people8 the ant1 to be the type of prudent industry8 the horse1 of spirit and daring8 and the lion1 of strength and regal state8 ,was it only an accident that prepared cruel beasts and disgusting1 poisonous reptiles as the types of evil passions and sins--that made the venom of the viper1 the cunning of the fox1 the blood-thirstiness of the wolf1 the folly of the ape1 and the filth of the swine1 symbols of foul1 subtle1 malignant sin and folly8 ,nature is full of these emblems4 ,the palm tree with its crown of glory1 the cedar of ,lebanon1 the fading flower and withering grass1 the early dew and the morning mist1 the thorn hidden among the leaves of the fragrant rose1 poisons sweet to the taste1 and medicines bitter as gall1--how all these natural things preach to men sermons concerning spiritual verities6 ,there is no virtue or grace which is not commended to man by its image of beauty in the animal tribes2 there is no vice against which men are not warned by its loathsome1 disgusting form shadowed out in the instinctive baseness of irresponsible brutes4 ,thus we find earth1 air1 and sky to be full of silent voices proclaiming in the ears of man that which he most of all needs to remember4 ,these types and symbols of virtue and vice are specially needed by fallen beings4 ,they seem fitted for beings whose spiritual eyes are blinded and all their spiritual senses blunted--beings with whom there is no longer 'open vision' of spiritual realities4 ,these pictures of evil are most impressive to men who see in them the reflection of their own base passions4 ,how the fetid goat and the swine wallowing in the mire speak to the lecherous man and the drunkard6 ,in a world of sinless beings these mimic vices would seem rather to mar ,god's handiwork4 ,set the human race1 fallen as it is1 in a world where the patience of daily industrious toil would not be needed1 and the race would rot with putrid1 festering vice4 ,remove all danger1 and men would forget and deny that the ,creator holds them responsible4 ,let no evil consequences follow evil-doing1 and men would cease to make a distinction between right and wrong4 ,take away death1 and they would deny the existence of a spiritual world4 ,but in this world ,god has hedged men around with checks and penalties and painful discipline1 such as are of use only in dealing with sinners4 ,i conclude1 therefore1 that ,god prepared this world as it now is as a place of discipline for a fallen race4 ,this is the use to which he has devoted it in the past2 and when there is no longer need of such a world for the discipline of men1 we learn from the word of ,god that a 'new heaven and a new earth' shall be provided4 ,this world is thus declared to be an unfit abode for the glorified saints4 ,to judge1 then1 of the wisdom and goodness of ,god in the works of nature1 we must keep in mind the object for which the ,creator prepared the world4 ,ansel1 tell us how this strikes you4 ,i never thought of it in this way before1 he answered2 indeed ,i have thought very little of this subject1 but-- ,tinkle1 tinkle went the bell upon the superintendent's desk4 ,this was the second time the superintendent had struck his bell1 but ,mr4 ,wilton had been so intent upon his subject that he did not hear the first ringing4 ,the school was dismissed1 but ,mr4 ,wilton remained with his class to fix upon the particular department of nature which they would study4 ,he found that all were studying natural philosophy1 and had recently gone over the subject of heat4 ,at his recommendation1 therefore1 they agreed to examine1 as a specimen of ,god's works1 his management of heat in the world4 ,mr4 ,wilton requested them to review the subject during the week1 and be prepared to state and apply the general principles touching the nature1 phenomena1 and laws of heat which they had already learned4 ,this work they will enter upon next ,lord's ,day4 ,,chapter ,,iii4 ,a ,,difficult ,,question4 ,during the week1 ,ansel1 ,peter1 and ,samuel were busy reviewing and fixing in memory what they had already learned of the nature and laws of heat4 ,they were not only interested in the new line of study1 and desirous of pleasing ,mr4 ,wilton1 but they also felt that their scholarship was to be tested1 and each one was ambitious of standing equal to the best4 ,ansel1 of course1 was busy and ambitious4 ,the lesson was coming somewhat upon his own ground1 and he felt in no wise unwilling to show how well he had mastered the subject4 ,he entered upon it with feelings a little different1 however1 from his anticipations4 ,the explanation which ,mr4 ,wilton had given of the purpose of the ,creator in making such a world seemed to him very reasonable4 ,he could make no objection to it4 ,but that explanation had taken away at one sweep a whole store of objections to ,god's goodness which he was waiting to bring out as soon as a good opportunity was presented4 ,a world designed for the dwelling-place of sinners--sinners not already given over and doomed to final wrath1 but to be recovered from sin and trained in virtue and holiness1 or1 if incorrigible1 to be held in check and used as helps in the discipline of the righteous--he plainly saw must be as unlike a world fitted up for holy beings as a reform school is different from a home for kind and obedient children4 ,those arrangements which he had thought the most painful and objectionable might1 after all1 be the wisest and best4 ,he did not see where to put in a reasonable objection to ,mr4 ,wilton's unexpected argument1 yet he did not feel quite satisfied to confess to himself that he was so soon and so easily defeated4 ,in this state of mind1 on ,saturday morning he met ,mr4 ,hume upon the street4 ,good-morning1 ,ansel1 said ,mr4 ,hume4 ,good-morning1 returned ,ansel4 ,i hear1 said ,mr4 ,hume1 that you have given up studying the ,bible in your ,bible class1 and have begun the study of natural philosophy4 ,is that so8 ,not quite true1 ,mr4 ,hume4 ,we are to examine some department of the works of ,nature1 and see what indications appear of the ,creator's wisdom and goodness4 ,that is a little different from the report which came to me4 ,but what did you learn last ,sunday8 ,mr4 ,wilton told us that in order to judge of the wisdom and goodness of ,god in any of the affairs of this world we must consider the object for which that arrangement was designed4 ,he said that if a man examine a cotton-gin1 supposing it to be a threshing-machine1 he would be likely to pronounce it a foolish and worthless contrivance2 and that the fine edge of a razor would be worse than useless upon the cutter of a breaking-up plough4 ,he told us that the earth was not prepared as the dwelling-place of sinless beings1 but as a place of discipline for the fallen human race1 and that we ought not to look upon it as the choicest specimen of workmanship which the ,creator could construct4 ,i have heard that ,mr4 ,wilton believes something of that kind4 ,ansel1 have you studied geology8 ,i have read a little upon that subject and have heard some lectures4 ,can you tell me1 then1 whether or not the natural laws which prevailed on the earth ages and ages ago1 before the earth was fit for men to live upon it1 are the same as those which have been in operation in these later ages1 since men have inhabited it8 ,i suppose that the same laws have prevailed from the beginning of the geologic periods4 ,i think that geology makes that very evident4 ,if that were not so1 said ,mr4 ,hume1 the past history of the globe would be a riddle to us2 it would be confusion worse confounded4 ,in regard to those early ages we could not reason from cause to effect1 for we should know nothing of the forces and principles then in existence4 ,in geologic studies we judge the past from the present1 and if that be not a trustworthy method of reasoning1 all the conclusions of geologists are as worthless as dreams4 ,have you any reason to suppose1 from what you have read on this subject1 that a curse changed the character of the earth as a dwelling-place for man some six thousand years ago8 ,is it true1 as ,milton says1 that then ',the sun ,had first his precept so to move1 so shine1 ,as might affect the earth with cold and heat ,scarce tolerable1 and from the north call ,decrepit winter--from the south to bring ,solstitial summer's heat'8 ,did the ,creator then ',bid his angels turn askance ,the poles of earth twice ten degrees and more ,from the sun's axle'8 ,or was death then first introduced among the brute creation1 as ,milton fancies8-- ',but ,discord first1 ,daughter of sin1 among the irrational ,death introduced through fierce antipathy2 ,beast now with beast 'gan war1 and fowl with fowl1 ,and fish with fish2 to graze the herb all leaving1 ,devoured each other4' ,animals must have died1 said ,ansel1 for their remains lie imbedded in rock which certainly existed before man lived on the earth4 ,i wish you would ask ,mr4 ,wilton one question for me4 ,i am willing to ask him any proper question1 and ,i suppose you would not wish me to ask any other4 ,i certainly would not4 ,will you ask him how it was possible for man not to sin and fall if ,god created the world for a sinful race myriads of ages before man was brought into existence8 ,it would seem that if man had remained obedient he could not have lived pleasantly in a world prepared for sinners1 and at the same time1 by man's obedience1 all the ,creator's plans touching this world would have been dislocated and disappointed4 ,i will ask him1 sir1 said ,ansel1 at the first good opportunity4 ,this good opportunity occurred sooner than ,ansel expected1 for1 before entering upon the proposed lesson the next ,lord's ,day1 ,mr4 ,wilton said to the class3 ,i wish in these lessons to advance carefully and safely1 and1 as far as possible1 have everything well understood4 ,for that reason ,i invite you to speak freely of any difficulties or objections which may suggest themselves to your own minds or which you may hear presented by others4 ,at the close of the last lesson the views which ,i had presented to you seemed very reasonable1 but it is possible that1 as you have thought upon the subject during the week1 objections may have arisen in your minds4 ,if so1 ,i should be glad to hear them now4 ,there are many things1 said ,peter1 of which ,i cannot see the use1 even if we suppose that the earth was designed as the dwelling-place of sinners4 ,it would be very surprising indeed if you could unravel all the mysteries of creation in a week's time4 ,wiser men than any of us have spent a lifetime in searching out the meaning of ,god's works1 and died still in the dark upon many points4 ,we need not expect to unravel and understand all the deep1 complex1 and delicately-interwoven contrivances in a world so vast and curious as this4 ,the world is a great mystery--mysterious as a whole1 and mysterious in all its parts--upon any supposition4 ,but the explanation which ,i gave of its design furnishes a sufficient reason for the great outline of creation4 ,this gives a reason for the pains and miseries which dog man at every step4 ,this gives a reason for the earth's being left rugged and sluggish1 bringing forth thorns and thistles1 and requiring to be subdued by patient industry4 ,it shows a ground for the necessity of exhausting toil under a frowning sky and mid miasmatic airs--for the liability to diseases and accidents1 and the hard necessity of death4 ,these great elements of divine providence are not stripped of their halo of mystery1 but with this explanation they are seen to form a harmonious whole for the accomplishment of a great and glorious purpose4 ,mr4 ,wilton paused4 ,then ,ansel said1 ,mr4 ,hume wished me to ask you a question4 ,very well1 ,i should be glad to hear it4 ,i hope1 indeed1 that he sends his question from interest in the subject1 and not with the design of perplexing us4 ,i wish also that he were here to ask the question and hear the answer for himself4 ,but what is the question8 ,he wished me to ask how it was possible for man not to sin and fall if ,god placed him in a world prepared for a race of sinners and unfitted for a sinless race4 ,he said that in such a case1 if man had remained obedient1 the plans of ,god would have been disarranged4 ,what answer did you try to give him1 ,ansel8 ,i did not try to make any explanation4 ,it seemed to me a very great objection4 ,i did not see how such a course was consistent with ,god's righteousness4 ,and you are not the first person who has objected to this as a great inconsistency4 ,i am afraid the discussion will take more time than we ought to spare1 but now that the question has been asked and the objection presented1 ,i must take time to answer it1 even if it consume the whole half hour4 ,in considering this subject1 as well as many others1 we need to remember that the existence of difficulties is no objection to a principle or a fact4 ,difficulties wholly inexplicable by man attend facts and principles which must be true4 ,a fact may be incomprehensible1 though undeniable4 ,the great ,doctor ,johnson said1 ',there are insuperable objections against a plenum1 and insuperable objections against a vacuum1 yet one of these must be true4' ,what did he mean by that1 ,samuel8 ,he meant1 ,i suppose1 that we could not explain the possibility that any space should be wholly empty of matter1 and could no more explain the possibility that any space should be filled with matter1 but that all space must be filled1 or else there must be empty space4 ,whether we can explain the possibility or not1 one of them must be true4 ,that is right4 ,the same is true of many other facts besides a plenum and a vacuum4 ,we cannot conceive of infinite space2 we cannot conceive that space should not be infinite1 but bounded4 ,we cannot conceive of the creation of the world from nothing1 and no more can we conceive of its eternal existence4 ,the truth is that the mind of man cannot grasp such subjects so as to reason upon them correctly4 ,no sooner do we attempt to reason about the infinite things of ,god than we run into absurdities and reach the most contradictory conclusions4 ,and in this respect it makes no difference with what principle or proposition we start if it only contain some infinite element4 ,let me give you a simple illustration from geometry--an illustration which1 very likely1 is familiar to you3 the larger a circle1 the less is the curvature of the line which bounds it2 that is1 the more nearly does that line approach a straight line4 ,an infinite circle must be bounded by a straight line1 because with any degree of curvature the circle would be less than infinite4 ,but a straight line cannot bound a circle4 ,the attempt to reason about an infinite circle brings us at once to the most palpable absurdities and contradictions4 ,or take this illustration3 the whole of a thing is greater than any of its parts4 ,but divide a line of infinite length in the middle1 and each part is infinite4 ,we reach the conclusion either that the half is equal to the whole or that other wholly incomprehensible proposition1 that one infinity is twice as great as another infinity4 ,i have made these statements to show you that the existence of difficulties does not indicate1 much less prove1 that a fact is not real and true4 ,mr4 ,hume thinks the fact that the earth existed in its present condition before men sinned an insuperable objection to the view that this world was prepared as a place for the discipline of a fallen race4 ,but let us look at the other side1 and see if equal objections do not exist4 ,the ,creator foresaw the fall of man2 is there no objection to the supposition that1 knowing that man would sin1 ,god made no provision for it8 ,on the one supposition he foresees the evil and makes no provision2 on the other1 he foresees it and provides for the catastrophe4 ,the former supposition certainly involves the greater difficulties4 ,the objector may reply that the plan of ,god1 by embracing the fall of man and including it as one of its essential elements1 made that fall necessary4 ,but why should not ,god embrace in his plan that great event1 the fall of man1 which he foresaw in the future8 ,would it have been wiser and better to leave out of account that most stupendous fact in the history of the human race8 ,this same objection1 which ,mr4 ,hume and many others have brought forward1 lies with equal force against the great central fact of the gospel1 the death of ,christ4 ,god's plan touching this world included the incarnation and death of his ,son4 ,jesus1 the ',lamb of ,god1' is spoken of as 'slain from the foundation of the world4' ,rev4 xiii4 #h4 ,but the incarnation and death of ,christ presuppose the apostasy of the human race4 ,did this plan touching ,christ make the apostasy of man a necessity8 ,if preparing a world--fallen1 so to speak1 beforehand--for a race which ,god foresaw would fall1 be inconsistent with his righteousness1 it must be equally inconsistent to prepare a ,saviour beforehand for that same race4 ,again1 the divine plan touching the death of his ,son included his betrayal by ,judas and his crucifixion by the ,jews4 ,if ,judas had known that ,god had poised the salvation of man upon the pivot of his treachery1 he would doubtless have argued as ,mr4 ,hume and others are accustomed to do4 ,but did ,god's plan excuse his treason against his ,lord8 ,his own conscience1 piercing and rending his soul with remorse1 drove him to self-destruction1 and ,christ confirmed the sentence of his conscience and called him the 'son of perdition4' ,the fact that ,god weaves the foreseen crimes of men into his plans is no palliation of their guilt4 ,would it be wise and well to take no account of foreseen events8 ,jesus has gone to prepare mansions for those who will1 as he foresees1 believe in him3 why not make provision for foreseen evils also8 ,our civil government1 knowing the liability to crime among men--a liability which the experience of man has shown to be a practical certainty--makes provision for those crimes by maintaining a police1 reform schools1 prisons1 and armies4 ,the ,governor of the universe1 knowing the liability of man to sin and fall--a liability which by his foreknowledge was to him a certainty--made provision for that foreseen apostasy4 ,he made provision1 both by the creation of a world suited to a sinful race kept under a probation of mercy1 and by appointing a ,redeemer1 the ',lamb of ,god1' slain1 in the eternal purpose1 before the foundation of the world4 ,if ,mr4 ,hume's objection has force at all1 it has force against every wise provision of ,god to meet the consequences of man's foreseen wickedness4 ,it is wise1 forsooth1 on man's part1 to foresee coming evil and prepare for it2 but if ,god do this1 men count it worse than folly3 they declare it to be an endorsement of the evil6 ,so foolishly do men reason about the high things of ,god6 ,my answer to ,mr4 ,hume1 then1 has four parts3 #a4 ,the existence of unexplainable difficulties does not disprove the truth and reality of any fact or principle4 #b4 ,the supposition that ,god made provision for the present apostasy of the human race is burdened with fewer and smaller difficulties than its denial4 #c4 ,the word of ,god declares that he did make provision for the fall of man by the pre-appointment of a ,redeemer4 #d4 ,that style of reasoning which seeks to justify or palliate man's first sin because ,god prepared this world for a fallen race would palliate and justify all wickedness1 because the sins of men are woven into every figure of the web of divine providence4 ,not the treason of ,judas alone1 but the whole sum of man's evil-doing1 is embraced in the far-reaching plan of ,god4 ,how this magnifies the wisdom of ,god6 ,he binds together in one bundle his own righteousness and the sins of men1 in a most intricate interlacing1 yet without blending the two and without staining the glory of his holiness4 ,i hope ,i have made this plain4 ,do you think1 ,ansel1 that you can repeat the substance of this answer to ,mr4 ,hume8 ,i will try1 sir1 if he asks4 ,you will all notice1 added ,mr4 ,wilton1 that ,i have not denied that there is a deep mystery in this preparation for the sins of men not yet created1 and that ,i have not attempted to explain this mystery4 ,i have only tried to show that the admission of the view ,i have given you is more satisfactory to reason than its denial1 and that the mysteries of this view are not unreasonable and self-contradictory1 for the greatest mysteries are often the most reasonable things in the world4 ,my introduction has become much longer than ,i designed1 but now let us turn our attention to the subject of the lesson4 ,to aid us in understanding ,god's wise arrangements in the management of heat1 we need1 first1 to consider what heat is and to review the laws of its action4 ,without this1 we could look on and wonder at ,god's working in nature1 but could not explain that which we saw4 ,ansel1 will you state the theories which have been held touching the nature of heat8 ,i will do it as well as ,i can4 ,the ancient philosophers supposed fire to be one of the four elements of which all bodies were composed4 ,the three other elements were earth1 air1 and water4 ,these four elements were mingled in various proportions4 ,of these1 fire was esteemed the purest and most ethereal2 this constantly tended upward to the empyrean1 the highest heaven1 where the element of fire and light was supposed to exist unmingled and pure4 ,in the seventeenth century1 ,beccher and ,stahl1 two ,german chemists1 brought forward what is known as the phlogistic hypothesis4 ,they supposed that every combustible body held in composition a pure1 ethereal substance which they called phlogiston1 a ,greek word which signifies burned1 and that in combustion this phlogiston escaped4 ,flame was supposed to be this escaping phlogiston4 ,these were the notions held about fire and combustion1 but they are hardly worthy to be called theories of heat4 ,the discovery of oxygen by ,dr4 ,priestley of ,england1 in #aggd1 and the introduction of the balance by ,lavoisier of ,france1 joined with the ever-enlarging circle of facts to be explained1 rendered the phlogistic hypothesis untenable1 and it was thrown aside4 ,until a few years since the caloric theory was generally received4 ,according to this theory1 heat is a substance1 a subtle ether1 diffused through all bodies and surrounding their atoms4 ,this ether has been supposed to have a strong attraction for the atoms of every other substance1 while between its own atoms a strong repulsion exists4 ,in solid bodies each atom of matter1 or in compound bodies each cluster of atoms1 has been supposed to be surrounded by a little atmosphere1 so to speak1 of caloric1 which prevented the atoms from coming into absolute contact4 ,according to this theory1 heat expands bodies by increasing and deepening these minute atmospheres1 thus pressing the atoms farther from each other4 ,you need not explain this theory farther1 said ,mr4 ,wilton2 we have hardly time to go into the history of theories4 ,tell us the latest received theory4 ,the theory now commonly believed is called the mechanical or dynamic theory4 ,according to this theory1 the essence of heat is motion4 ,a hot body is one whose atoms are in a state of rapid and intense motion or vibration2 and the sensation of heat on touching a hot body arises from the impact1 or rapid blows1 of the agitated atoms1 communicating the same atomic vibration to the flesh and nerves of the hand4 ,very well stated1 ,ansel4 ,this is the theory now more commonly received4 ,the caloric theory1 like the crude notions of the old ,greek philosophers about fire1 and like the phlogistic hypothesis1 has been rejected because it failed to explain the phenomena of heat4 ,whether the dynamic theory is destined to share the same fate remains to be seen4 ,it seems1 however1 to have a better foundation than its predecessors4 ,the dynamic theory1 though recently made popular1 is by no means a recent conception4 ,it was advocated by such men as ,bacon1 ,newton1 ,rumford1 ,davy1 ,locke1 and others4 ,locke1 the distinguished intellectual philosopher who lived in the latter half of the seventeenth century 7born #afcb1 died #agjd71 said1 ',heat is a very brisk agitation of the insensible parts of an object1 which produces in us that sensation from which we denominate the object hot1 so that what in our sensations is heat in the object is nothing but motion4' ,benjamin ,thompson1 an ,american gentleman who went to ,europe in the time of our revolution1 and for his scientific fame was made ,count ,rumford1 and became the founder of the ,royal ,institution of ,england1 declared that he could form no conception of the nature of heat generated by friction unless it were motion4 ,a beautiful generalization has been made to show how well this idea of heat harmonizes with the entire plan of the universe4 ,in the whole boundless universe each system of worlds1 like our solar system1 may be regarded as a molecule1 or complex atom4 ,these cosmical molecules1 or complex atoms of the universe1 are in motion through unmeasured space4 ,in these systems of worlds the planets1 with their satellites1 are the molecules1 and they are in motion--indeed1 they commonly have several motions4 ,our earth1 for example1 rotates upon its axis once each day2 it revolves in its orbit around the sun once each year1 and the axis of the earth has a slow wabbling motion which produces the precession of the equinoxes1 requiring #be1hfh years for a complete revolution4 ,the earth also is made up of parts1 and all these are in ceaseless motion4 ,as said the old ,greek philosopher1 ',all things flow'--that is1 everything is in a state of change4 ,solomon has well described this perpetual movement and change3 ',one generation passeth away1 and another generation cometh4 ,the sun also ariseth1 and the sun goeth down1 and hasteth to his place whence he arose4 ,the wind goeth toward the south1 and turneth about unto the north4 ,it whirleth about continually1 and the wind returneth according to his circuits4 ,all the rivers run into the sea2 yet the sea is not full2 unto the place from whence the rivers come1 thither do they return again4 ,all things are full of labor2 man cannot utter it4 ,the eye is not satisfied with seeing1 nor the ear filled with hearing4 ,the thing that hath been1 it is that which shall be2 and that which is done is that which shall be done1 and there is no new thing under the sun4' ,eccles4 i4 #d-i4 ,it is certainly in harmony with this universal movement that the atoms of matter1 though they seem so closely packed1 should in their inconceivable smallness through inconceivably minute spaces vibrate1 or rotate1 or revolve through an orbit1 never at rest4 ,intensity of heat we may think of as intensity of this atomic motion--a wider swing1 so to speak1 in their vibration or revolution4 ,this1 of course1 requires a wider separation of the atoms and a consequent expansion of bodies4 ,a feebler atomic motion permits the atoms to approach each other4 ,in this manner we explain the enlargement of bodies by heat and their contraction by decrease of temperature4 ',the ideas of the best-informed philosophers are as yet uncertain regarding the exact nature of the motion of heat1 but the great point at present is to regard it as a motion of some kind1 leaving its more precise character to be dealt with in future investigation4' ,this is the most we can do at present4 ,what is the evidence1 asked ,samuel1 that the dynamic theory of heat is true8 ,the evidence that any theory is true is its ability to explain the facts or phenomena with which it has to do4 ,if it explains all the facts and contradicts no known principles1 it is regarded as true1 or at least no objection can be made to it4 ,let me illustrate4 ,astronomers had long inquired what force or law controlled the movements of the heavenly bodies4 ,at length ,newton answered1 ,a force of attraction between bodies which decreases in proportion as the square of the distance between them increases4 ,this explanation has been found sufficient to explain all the known facts in the working of the heavenly bodies4 ,upon the basis of this theory astronomers calculate the positions of planets and comets for years and centuries to come4 ,this theory led to the discovery of the planet ,neptune1 the last discovered of the primary planets4 ,for thirty years irregularities in the motion of ,uranus had been noticed4 ,these variations were so slight that if another planet had revolved in the proper orbit of ,uranus they would have seemed to the naked eye1 throughout their course1 one and the same star4 ,this slight irregularity of motion was so nicely measured that the place of the unseen planet which caused it was almost exactly calculated from the estimated force and direction of its attraction4 ,this theory of a universal attraction of gravitation so well explains all the facts in the case1 and has become so universally received1 that we are liable to forget that1 after all1 it is nothing but a theory4 ,our idea of the structure of the solar system was at first only a theory4 ,the astronomer does not see the planets revolving in regular circles through the heavens and moving around the sun4 ,he only sees the shining points moving back and forth upon the concave vault1 doubling and crossing their tracks apparently in the greatest disorder4 ,how shall their motions be explained8 ,astronomers have found that the motions of planets revolving around a central sun1 when seen from one of the planets1 must present just these apparent irregularities4 ,this explanation is so full and complete that it is now counted not a theory1 but an established fact4 ,the same may be said of the shape of the earth4 ,the dynamic theory of heat explains the phenomena of heat better than any other explanation that has been proposed4 ,it explains the radiation of heat from the sun or from any other hot body3 vibrations or impulses are propagated through that ether which is supposed to fill all space4 ,it explains the conduction of heat through solid bodies in the same manner4 ,it explains the expansion of bodies3 the atomic motion forces the atoms of bodies farther apart4 ,it explains the production of heat by friction or collision1 which no other theory is able to do3 the shock of the collision generates this atomic vibration4 ,it explains the production of heat by combustion3 the atoms of oxygen and carbon or hydrogen dash against each other and generate heat by the collision4 ,this theory explains the transmutation of motion1 or living force1 and electricity1 into heat1 and the transmutation of heat into electric or mechanical force4 ,these points will come up again1 and ,i now only refer to them in answering ,samuel's question4 ,the dynamic theory explains the phenomena of heat and its relations to force1 light1 and electricity exceedingly well1 and for this reason men look upon it with favor and count it as probably true4 ,if in the progress of scientific investigation it shall be found to explain all the new facts discovered and meet well all the demands made upon it1 it will at length be received as an admitted principle in physical science4 ,the wave theory of light and the vibratory theory of sound may be looked upon as thus established4 ,at our next lesson we shall take a rapid review of the effects and laws of heat4 ,,chapter ,,iv4 ,,heat ,a ,,gift ,,of ,,god4 ,the class is again promptly in place and ready for work4 ,as ,i announced a week ago1 said ,mr4 ,wilton1 we will to-day take a rapid review of the effects and laws of heat4 ,will you tell us1 ,peter1 the first and chief of these effects8 ,yes1 sir3 combustion4 ,what is combustion8 ,commonly the rapid union of oxygen with some combustible substance1 attended with the evolution of heat4 ,was your answer correct1 then8 ,no1 sir1 said ,peter1 blushing2 ,i spoke before ,i thought4 ,will you correct your answer8 ,the first and chief effect of heat is expansion4 ,that is right4 ,our sensation of heat is of course only a sensation--merely the feeling which results from the effects of heat upon our nerves--but the chief physical effect of heat is the expansion of bodies4 ,the chemical qualities of bodies are not changed3 they are not made either heavier or lighter4 ,a sufficiently high temperature renders bodies luminous1 and then we call them red hot or white hot4 ,solid bodies begin to be luminous at a temperature of about one thousand degrees4 ,but the one invariable effect of heat1 with two or three apparent exceptions1 is expansion4 ,you may mention1 ,samuel1 some familiar illustrations of the effect of heat in expanding bodies4 ,the blacksmith heats the wagon-tire in order that it may easily slip over the wheel4 ,if a kettle be filled with cold water1 by heating it the water is expanded and runs over4 ,i have noticed that the spaces between the ends of the successive iron rails upon the railroad are larger in winter than in summer1 showing that the rails are shorter in winter than in summer4 ,while skating during the cold winter evenings upon the mill-pond1 ,i have seen cracks in the thick ice start and run across the mill-pond with a roar almost like thunder4 ,the ice was contracted by the cold till it could no longer fill the whole space between the banks1 and being frozen fast to the banks1 it was torn asunder4 ,the mercury in the tube of a thermometer is constantly expanding or contracting by every change of temperature4 ,yes1 those are all good illustrations1 and we might go on to mention others equally good by the score4 ,in cold countries1 during the intense cold of winter1 the surface of the earth cracks by shrinkage1 just as you have seen the ice upon the mill-pond torn in two4 ,the ,britannia iron tubular bridge over the ,st4 ,lawrence at ,montreal rises and falls two and one-half inches on account of greater expansion of the upper surface when exposed to the heat of the sun1 while a loaded freight train causes a depression of but one-fourth of an inch4 ,a few years since1 in order to make some philosophical experiments connected with the rotation of the earth upon its axis1 a ball was suspended by a wire in the interior of ,bunker ,hill monument4 ,by this means it was accidentally discovered that the heat of the sun1 expanding the sides of the monument exposed to its rays1 caused the whole monument to sway back and forth daily4 ,here ,ansel raised his hand4 ,what is it1 ,ansel8 ,i was going to mention the belief of geologists that the mountain ranges were thrown up by the contracting of the earth's crust on account of cooling4 ,that is an illustration of contraction by loss of heat on an enormous scale4 ,the materials which form our globe may have existed in the beginning in a nebulous or gaseous state4 ,there is certainly very good reason for believing that the earth was once in a fluid state1 the whole of its substance molten by intense heat4 ,it is certain that the interior is now hot1 and portions of it molten4 ,it is by very many believed that the whole interior is molten4 ,the crust of the earth may have been formed by cooling4 ,if after an outer crust had been formed1 and its temperature had fallen so low as to become nearly stationary1 the interior mass continued to cool1 the molten mass would tend to sink away from the crust and the crust would sink in upon it by wrinkling4 ,thus mountains may have been formed4 ,along the line of fracture the easiest vents would be formed for volcanoes4 ,but this carries us somewhat aside from our subject1 and as the expansion of bodies by heat has been sufficiently illustrated1 we will leave it4 ,will some one now state the manner in which the dynamic theory of heat explains this expansion8 ,samuel answered3 ,i think you have already given us the explanation4 ,i have briefly referred to it1 but you may give it again4 ,the atomic motion which is supposed to constitute what we call heat1 whatever that motion be1 whether a vibration or rotation or revolution1 requires that the atoms of bodies shall not be packed in absolute contact1 and the more intense the agitation or the wider the swing of the vibration or revolution1 the greater must be their separation4 ,hence heat expands bodies by thrusting their atoms farther apart4 ,that will do1 said ,mr4 ,wilton4 ,let us look now at some of the secondary effects of heat4 ,you may mention some of them1 ,ansel4 ,heat relaxes or overpowers the cohesive attraction of bodies4 ,what is cohesive attraction8 ,it is that force which binds together the atoms of matter in simple substances1 that is1 bodies like iron or copper or silver1 composed of but one kind of substance1 or in compound bodies it is the force which unites the compound molecules of matter4 ,give us now some illustrations of the effect of heat in overcoming cohesive attraction4 ,the blacksmith heats his iron in order to overcome its cohesive attraction and render it soft1 that he may easily hammer it4 ,the founder heats his metal till its cohesion is so far destroyed that it becomes fluid and can be poured into the mould4 ,heat relaxes the cohesive force of ice and changes it to water1 and by farther heating its cohesion is entirely overcome and the water is changed to a gas4 ,we use heat also in cooking our food1 spoke up ,peter3 is it not because heat destroys the cohesive attraction1 and thus softens it8 ,if that were the only effect of heat upon food1 said ,mr4 ,wilton1 we should be obliged to eat our food hot1 for as soon as it cooled the cohesion would return and the food would be raw again4 ,the operation of heat in cooking is various1 and part of the effect is commonly to be ascribed to the water in which the food is cooked or to that which is contained in it4 ,by the combined agency of heat and water starch swells to twenty or thirty times its original bulk and the minute starch grains burst open4 ,in cooking potatoes the starch of the potato absorbs a portion of the water that is in it1 and thus renders it dry and mealy4 ,the action of heat and water upon rice1 wheat1 and other grains is similar to their operation upon starch4 ,in the baking of bread the starch is converted into gum4 ,in boiling flesh the effect is partly due to the solvent powers of water3 the juices of the flesh are extracted1 the gelatin is dissolved1 the fat is liquefied1 and the cells in which the fatty matter is held more or less burst1 the albumen is solidified1 and by long boiling the texture and fibre of the flesh are destroyed4 ,the albumen of an egg1 that is1 the white1 coagulates by heat4 ,but in most of these processes the action of heat cannot be separated from that of water4 ,but there is another effect of heat very important both in nature and in the arts4 ,what is that8 ,the quickening of chemical affinity1 answered ,samuel4 ,that is right3 heat is necessary for the operation of chemical affinity4 ,perhaps this is only a weakening of the cohesive force1 thus allowing the chemical attractions to assert their strength4 ,but the fact is that1 while in many cases the chemical affinities act with great energy at ordinary temperatures1 in other cases they slumber1 however closely the substances are brought into contact1 till their temperature is raised4 ,samuel1 you may mention some illustrations of this principle4 ,a few months ago ,i visited ,hazard's powder mills1 in ,enfield1 ,connecticut1 and there learned how gunpowder is made4 ,the charcoal1 the sulphur1 and the nitre are first finely pulverized1 then ground together for hours till thoroughly mixed1 and afterward pressed together4 ,this mass is then broken into grains and the grains polished4 ,but though these elements are brought into so close contact1 yet they do not combine and explode till heat is applied4 ,the same is true of the combustion of wood and coal4 ,the carbon and the hydrogen of the fuel are constantly surrounded with the oxygen of the air1 but they do not take fire and burn1 that is1 they do not combine with the oxygen1 till they are raised to a red heat1 or perhaps even to a higher temperature4 ,if a stove filled with burning coal be cooled down to a low temperature by applying ice1 the combustion will cease1 the fire will go out4 ,our teacher at the academy on one occasion heated a steel watch-spring red hot and plunged it into a jar of oxygen1 and the steel spring began quickly to burn with great fury4 ,you have given us good illustrations1 ,samuel1 and that which is true of carbon and hydrogen and oxygen is true of substances in general4 ,the effect of heat in producing chemical changes is very important everywhere4 ,it is seen not only in the chemist's laboratory and in the artisan's shop1 but also in the laboratory of ,nature4 ,plant a grain of corn in midwinter3 why does it not germinate and grow8 ,nothing is needed but the requisite heat to quicken the chemical affinities into action4 ,earth and air furnish the needed material for the growth of forest trees in winter as well as in summer1 but the cold holds in check the chemical forces and prevents the requisite chemical combinations4 ,no sooner does the sun quicken that atomic vibration or revolution which we call heat than vegetable growth begins4 ,heat is necessary for those chemical changes by which food is digested in the stomach and the processes of nutrition carried on in every part of the body4 ,if a man finish his dinner with ice cream or ice water1 the process of digestion is delayed till the contents of the stomach recover their proper temperature4 ,this is one chief reason why warm1 comfortable clothing is so very important1 especially for children4 ,all the vital processes are chemical processes3 they are carried on through chemical affinities4 ,unless the body be kept at a suitable temperature1 these processes are feeble and imperfect1 nutrition and vital combustion are hindered1 and diseases are engendered4 ,these1 then1 are the chief effects of heat4 ,it expands bodies1 weakens cohesive attraction1 and quickens the chemical affinities into activity4 ,ansel again raised his hand4 ,what do you wish8 ,will you please tell us1 ,mr4 ,wilton1 how this weakening of cohesive attraction is explained upon the dynamic theory of heat8 ,i will do so with pleasure4 ,the increased atomic motion in the heated body throws the atoms farther apart1 as we have already learned1 and by this increase of distance their attraction is diminished4 ,if the earth were twice its present distance from the sun1 their attraction for each other would be four times less than it now is2 if its distance were three times as great1 their attraction for each other would be nine times less4 ,the attraction of gravitation diminishes in proportion as the square of the distance through which it must act increases4 ,perhaps cohesive attraction diminishes according to the same law1 though the spaces are so small that this cannot be demonstrated1 but it is certainly weakened by the expansion of bodies through the agency of heat4 ,here ,peter raised his hand4 ,what will you say1 ,peter8 ,do not men heat and burn bricks1 not to soften them1 but to harden them8 ,that is true1 said ,mr4 ,wilton2 but in this there is a process of drying as well as of heating1 and the hardening is due chiefly to the complete drying by the intense heat4 ,too great heat will melt bricks while in the process of burning4 ,i once heard a brick-burner say that he could melt the brick around the arches in his kiln in half an hour1 if he pleased to put in fuel and let the fire burn4 ,indeed1 almost every known solid substance has been fused by heat4 ,whether carbon has ever been melted is an unsettled question4 ,i would like to inquire1 said ,samuel1 why water will not burn4 ,is it because it evaporates before it reaches a sufficiently high temperature8 ,this is a little aside from our subject1 but the incombustibility of water is a provision of the ,creator so very important that we will stop to notice it4 ,i think1 however1 that by a little thought you yourself can answer the question4 ,tell me again what combustion is4 ,combustion is commonly the combining of oxygen with some other substance called a combustible4 ,the rusting of iron and the decay of organic bodies are forms of slow combustion4 ,now tell us the composition of water4 ,water is composed of oxygen and hydrogen--eight parts of oxygen to one of hydrogen1 by weight1 or two parts of hydrogen to one of oxygen1 by measure4 ,how is water formed from these two gases8 ,are they mixed together as oxygen and nitrogen are mingled in the air1 or are they chemically united8 ,they are chemically united3 they are burned together4 ,when hydrogen burns1 the product is water4 ,water is then a product of combustion4 ,can you not now tell why water is incombustible8 ,i think ,i now see the reason4 ,the oxygen1 being itself the supporter of combustion1 will not burn1 and the hydrogen has been already once burned in the formation of water4 ,and that which is true of water is true1 in a greater or less degree1 of other products of combustion4 ,the burning of charcoal produces carbonic acid1 and carbonic acid will not burn because it is the production of combustion4 ,a candle is extinguished by it as quickly as by water4 ,by a recent invention carbonic acid is used to extinguish conflagrations4 ,the carbon has once united with oxygen1 and a second combination with an additional amount1 or1 as a chemist would say1 with another equivalent1 of oxygen is much more difficult4 ,i think1 said ,samuel1 ,i now understand why water will not burn1 but will you please also to tell us why water puts out fire better than almost anything else8 ,in order to extinguish fire one of two things must be done3 either the supply of oxygen must be cut off or the combustible must be cooled down to a temperature below the burning point1 when the combustion will cease of itself4 ,when we shut the draught of an air-tight stove1 we check the combustion by shutting off the full supply of oxygen4 ,if we could wholly prevent the access of oxygen to the fuel1 the fire would at once be extinguished4 ,if oxygen should then be admitted again before the fuel had cooled down below the burning point1 combustion would at once begin again4 ,a blazing brand is extinguished by being thrust into ashes1 because it is shut away from oxygen4 ,in the same way we extinguish the flame of a candle with a tin extinguisher4 ,on the other hand1 fires often go out because the necessary temperature is not maintained4 ,water puts out fire in both these ways1 but especially by the second4 ,water poured in torrents from a fire engine upon a fire forms a film of water1 and the burning material shuts out the oxygen4 ,but the water acts chiefly by lowering the temperature4 ,no other known substance except hydrogen gas requires so much heat to raise it through a given number of degrees of temperature as water4 ,as much heat is required to heat one pound of water as thirty pounds of mercury4 ,hence1 water poured upon burning timber cools it to so low a temperature that it ceases to burn4 ,in addition to this1 we may notice that wood saturated with water cannot be heated above the boiling point of water till the water is evaporated4 ,as fast as the wood and the water rise or tend to rise above two hundred and twelve degrees1 the water changes into steam and carries away the additional heat4 ,the consumption of heat in the formation of vapor we must look at more carefully in a future lesson4 ,we will suppose that a house is in flames4 ,a fire engine throws a stream of cold water into the midst of the conflagration4 ,the cold water1 dashing against the burning wood1 cools the heated surface2 it is absorbed into the pores of the wood and hinders its rapid heating2 a portion of the water1 being changed into steam1 carries off the heat2 the steam1 mingling with the flame1 lowers the temperature of the burning gas1 and in proportion as steam fills the surrounding space oxygen is driven away4 ,a burning coal mine in ,england was once extinguished by forcing steam into it1 thus driving out the air which supported the combustion and cooling down the burning coal4 ,the advantages which men receive from these agencies of heat are so manifest that we cannot help noticing them4 ,i do not refer to the comfort of a pleasant temperature1 nor the impossibility of living in a temperature extremely low1 but to all those processes by which man subdues nature1 provides for himself food1 clothing1 and dwelling-places1 and builds up civilization4 ,heat is that force which enables man to accomplish his ends4 ,heat brings the iron from the native ore1 and heat renders it malleable and plastic to be shaped for man's uses4 ,heat quickens the chemical affinities and renders the arts of civilized life a possibility4 ,heat brings together oxygen and carbon in ten thousand furnaces1 and the heat engendered by the combustion1 changed to force1 drives the ponderous or nimble machinery which carries on the work of the world4 ,heat quickens the chemical affinities and causes the wheat to grow2 heat prepares the wheat for man's food2 and by the aid of heat that food is changed in man's body1 nutrition goes on1 the body is built up1 waste matter is removed1 and all the vital processes are supported4 ,without these agencies of heat--softening and subduing stubborn matter on the one side1 and quickening its forces on the other--man could not exist4 ,let me remind you that these agencies of heat are of ,god's devising4 ,if the operations of heat are beneficent to man1 it is because ,god wished to bless his creatures4 ,i am not much given to moralizing1 but when ,i see how completely these simple effects of heat meet man's wants1 ,i cannot help remembering and admiring the wisdom of the great ,designer4 ,it is ,god and not blind1 unconscious ,nature that is working4 ,this reminds me1 said ,samuel1 of the tradition in ,greek mythology that ,prometheus stole fire from ,jupiter and brought it down to man in a reed as a precious treasure4 ,it seems to me like a gift from heaven4 ,this mythological tradition has1 however1 one falsehood3 there was no need that men should steal fire from the gods2 ,god freely gave it4 ,heat is indeed a gift from heaven4 ,,chapter ,v4 ,,conveyance ,,and ,,varieties ,,of ,,heat4 ,to-day we review the modes in which heat passes or is conveyed from place to place4 ,it is evident that if heat were confined to the very place or point where it is generated1 it could subserve none of those uses to which it is now applied in the economy of ,nature or in the works and arts of man4 ,but heat passes from place to place with great facility1 and by one method1 with the speed of light1 it tends to diffuse itself evenly through all2 it seeks an equilibrium4 ,the modes of its diffusion1 or conveyance1 are three in number4 ,ansel may name them4 ,heat passes from place to place and from body to body by 'conduction1' by 'radiation1' and by 'convection4' ,what is meant1 ,ansel1 by the 'conduction' of heat8 ,the passing of heat from atom to atom and from particle to particle through a body is called conduction4 ,that is right4 ,i will call upon ,peter to give some illustrations of the conduction of heat4 ,the examples are so many1 ,peter answered1 that ,i hardly know what to mention first4 ,if ,i hold a pin in the flame of a lamp1 the part of the pin that touches the flame is first heated1 but soon the heat runs along the whole length of the pin and burns my fingers4 ,the parts of a stove which touch the fire are first heated1 and from them the heat spreads through the whole stove4 ,a pine-wood shaving1 kindled at one end1 is heated by conduction1 but the heat passes through it very little faster than the flame follows4 ,heat escapes from our bodies by being slowly conducted through our clothing4 ,there is no end to the examples of conduction which one might give4 ,we must not think of the conduction of heat1 said ,mr4 ,wilton1 as if it were a fluid slowly absorbed by a porous body1 as water poured upon the ground soaks into it1 or as water percolates through a lump of sugar and moistens the whole of it4 ,we must remember that the transfer of heat is not a transfer of any substance1 but a transfer of motion4 ,one atom is set in motion1 and strikes against another atom and sets that in motion1 and thus motion is communicated from atom to atom and from molecule to molecule through the whole mass of matter till every atom is agitated with the heat vibrations4 ,do all bodies conduct heat with equal rapidity8 ,no1 sir1 replied ,ansel2 there is the greatest possible difference4 ,some substances are called good conductors1 because heat permeates them so readily and rapidly2 others conduct heat very slowly1 and are called poor conductors or bad conductors4 ,that is right4 ,every child soon learns by experience to make a practical distinction of this kind4 ,he very soon understands that he can hold a stick of wood without burning his hand1 even though it be blazing at the other end1 but that when a piece of iron is red hot at one end he must not take hold of it at the other4 ,the child very soon learns to know the different feeling of a cotton night-gown from one of flannel1 and the difference in apparent warmth between a linen pillow-case and a woolen blanket4 ,after a room has been heated for a considerable time the various objects in it all become of the same temperature1 and the same is true in a cold room2 but how great the difference in the sensations produced by touching the oil-cloth and a woolen carpet in a cold room6 ,good conductors of heat1 if hot1 feel very hot2 or if cold1 feel very cold2 while poor conductors make a much less decided impression4 ,why is this1 ,samuel8 ,the good conductors receive heat or part with it very readily4 ,if the good conductor be hotter than our bodies1 it imparts its heat rapidly to our hand1 and because we receive heat rapidly from it1 it feels to us very hot4 ,or if it be colder than our bodies1 it takes heat from our hands very rapidly1 and gives the impression of being very cold4 ,poor conductors impart heat to the skin or take it away more slowly1 and hence feel as if their temperature were more nearly like that of the body4 ,the conducting qualities of bodies1 said ,mr4 ,wilton1 seem to depend chiefly upon their structure or the arrangement of their atoms4 ,bodies which are compact and solid in their structure convey heat more rapidly than those which are loose and porous4 ,hence solids are better conductors than fluids1 and fluids are better conductors than gases1 and among solids the metals are better conductors than organized bodies1 like wood or flesh1 and better than the loose and porous minerals4 ,in bodies of loose1 porous1 or fibrous texture1 the continuity of the conductory substance is constantly broken4 ,the particles in a mass of sawdust touch only at a few points1 leaving frequent spaces4 ,in woolen and cotton fabrics the points of junction of the fibres are very few1 comparatively4 ,for this reason the motion is not readily communicated from atom to atom4 ,the crystalline arrangement of atoms has an influence upon conduction of heat4 ,heat is conducted more rapidly in a direction parallel with the axis of crystallization than across that axis4 ,wood conducts heat more rapidly in the direction of the grain4 ,this arrangement seems to be well adapted for keeping trees warm in winter4 ,their roots reach down into the earth1 which remains warm in the coldest weather4 ,this heat of the earth travels along the fibres up through the tree1 while the heat conducted across the fibres escapes much more slowly into the open air4 ,the bark also1 being a very bad conductor1 hinders the escape of heat4 ,of metals1 silver is the best conductor4 ,i will give you a brief table which will show the great difference in the conducting qualities of some of the metals4 ,counting the conducting qualities of silver as #ajj1 the table is3 ',silver1 #ajj2 ,gold1 #ec2 ,copper1 #gd2 ,iron1 #ab2 ,platinum1 #h2 ,german ,silver1 #f2 ,bismuth1 #b4'--,youmans4 ,what is the second method by which heat passes from place to place8 ,it is radiated1 replied ,ansel4 ,and what is radiation8 ,it is motion in straight lines or rays diverging from a centre4 ,from a hot body heat is passing off in straight lines in every direction4 ,as a lamp radiates light1 so does a hot body radiate heat4 ,radiant heat1 said ,mr4 ,wilton1 moves with the same velocity as light1 that is1 one hundred and ninety-two thousand miles per second4 ,it also follows the same general principles as light in all its motions4 ,it is absorbed1 reflected1 or transmitted in the same manner as light4 ,and this is true of either luminous heat--that is1 heat radiated from a body which is red hot--or obscure1 or dark heat4 ,as there are good and poor conductors1 so there are good and bad radiators of heat4 ,the radiation of heat depends upon three conditions3 #a4 ,upon the temperature of the body4 ,the higher the temperature1 the more rapid and energetic is its radiation4 #b4 ,upon the surface of the radiating body4 ,a dull1 rough surface radiates heat more rapidly than a surface bright and polished4 #c4 ,upon the substance of the radiating surface4 ,with surfaces equally smooth and bright1 some substances radiate heat much better than others4 ,a surface of varnish radiates heat much more powerfully than a surface of gold or silver4 ,ansel1 you may1 if you can1 explain the radiation of heat4 ,i can give no other explanation than that radiation is conduction through that subtle ether which is supposed to pervade all space4 ,very well2 perhaps that is as good an explanation as can be given4 ,but it seems rather like the propagation of an impulse than the spreading of atomic vibrations in every direction4 ,the motion is propagated in straight lines4 ,if it be conduction1 it must be carried on by different vibrations from those of ponderable substances4 ,heat1 light1 and electricity are supposed to be all propagated through the same theoretical ether4 ,sir ,isaac ,newton estimated the density of the ether as seventy thousand times less than the density of our atmosphere1 and its elasticity in proportion to its density as four hundred and ninety millions times greater4 ,but the very existence of this universally-diffused ether is a supposition made to account for the phenomena of light1 heat1 and electricity2 and1 of course1 all its qualities must be theoretical also4 ,radiation is believed to be the propagation of a motion or impulse through an inconceivably rare and elastic ether4 ,peter1 what is the third method by which heat passes from place to place8 ,convection1 was his reply4 ,what is meant by convection of heat8 ,the conveyance of heat by carrying a heated body4 ,if ,i remove a hot iron or a kettle of hot water1 ,i must of course carry the heat which it contains4 ,a very good illustration of the convection of heat1 said ,mr4 ,wilton1 is seen in the common method of heating water4 ,the heat is applied at the bottom of the vessel containing the water2 as fast as the water at the bottom next the fire is heated1 it rises and carries the heat to the top2 cold water comes to take its place1 and this in turn is heated and rises and carries heat to the top4 ,this process is carried on till all the water comes to the same temperature4 ,thus water is heated by convection of heat4 ,a grander illustration is seen in winds and ocean currents4 ,warm winds carry heat enough to warm a continent1 and the mighty ocean currents are still more efficient in transferring heat from one part of the earth to another4 ,another point we need to understand4 ,when radiant heat falls upon a body1 what becomes of it8 ,it is disposed of1 answered ,samuel1 in one of three ways3 it may be reflected according to the same principles by which light is reflected2 or it may be transmitted1 that is1 pass through the body2 or it may be absorbed1 that is1 stop in it4 ,very well stated1 ,samuel4 ,in regard to reflection ,i need to say very little4 ,you know how light is reflected from a polished surface1 such as a lamp reflector3 heat is reflected in the same manner4 ,one fact you must bear in mind touching reflected heat3 it does not heat the reflecting body4 ,there is no need of telling you that light passes through certain substances4 ,it passes through gases and through some liquids and some solids4 ,the best of glass1 though it is so solid1 interposes very little hindrance to the passage of light4 ,heat in like manner radiates through certain solids4 ,luminous heat is radiated through glass4 ,rock-salt transmits dark heat also4 ,a plate of alum permits light to pass1 but stops both luminous heat and dark heat4 ,remember that transmitted heat1 as was said of reflected heat1 does not heat the body through which it passes4 ,i have seen boys make burning-glasses of ice4 ,the heat passes through them and burns that upon which it is concentrated1 while the ice itself through which the heat passes is not melted4 ,if a body have a good radiating surface1 that is1 if its surface be dull and rough1 the heat which falls upon it will be mostly absorbed4 ,the reflecting and absorbing qualities hold an inverse ratio to each other2 the better the reflecting qualities1 the worse the absorbing1 and the worse the reflecting1 the better the absorbing4 ,heat which is absorbed by a body commonly raises its temperature1 and remains in the body till it is slowly radiated or is conducted away by the air or other bodies which come in contact with it4 ,what is that heat called1 ,ansel1 which is absorbed by a body with no rise of temperature8 ,it is called latent heat4 ,that is the old and common expression1 but what is meant by latent heat8 ,the word latent signifies lying hidden or concealed4 ,latent heat1 as you suggested in your first question1 is that heat which a body receives without showing it by a change of temperature4 ,that name 'latent heat1' said ,mr4 ,wilton1 expresses the opinion of those who invented it2 they supposed that heat was in some manner hidden in certain bodies4 ,we must not suppose1 however1 that this latent heat continues to exist in bodies as heat2 latent heat is that heat which is converted into force or some other motion than the atomic heat vibrations1 and is employed otherwise than in raising the temperature4 ,you will understand this best by an illustration4 ,take one hundred pounds of ice at the temperature of thirty-two degrees1 that is1 as warm as is possible without melting4 ,that one hundred pounds of ice will absorb heat which would raise one hundred pounds of ice water through one hundred and forty degrees1 and by receiving that heat it is melted1 but the water produced has the temperature of thirty-two degrees4 ,it has received one hundred and forty degrees of heat1 but its temperature is not raised a single degree4 ,this one hundred and forty degrees of heat has been transmuted into force and employed in overcoming the crystalline attraction of the atoms of water4 ,let that ice water at thirty-two degrees of temperature receive one hundred and eighty degrees of heat1 and the water rises to two hundred and twelve degrees1 the temperature of boiling4 ,but whatever additional heat is absorbed brings no increase of temperature1 but transforms the water into steam4 ,it is employed in overcoming the cohesive attraction of the molecules of water and changing the liquid to a gas4 ,about one thousand degrees of heat is thus expended1 but the steam which is produced has only the temperature of two hundred and twelve degrees4 ,if the process be reversed1 the steam gives up1 as it is said1 the one thousand degrees of heat in returning to the condition of water and the one hundred and forty degrees in resuming the crystalline structure of ice4 ,the heat which was employed as force in overcoming the atomic and molecular attractions is transmuted again to heat1 and shows itself in raising the temperature4 ,and that which is true of water is true of any other substance in changing its form from a solid to a liquid or from a liquid to a gas1 or the opposite4 ,in an amount different for each kind of matter1 in all these changes of condition1 heat is transmuted to force or force to heat4 ,these transmutations are going on ceaselessly in the operations of ,nature1 and without understanding them we cannot appreciate the wonderful operations of heat in the world4 ,the heat of the sun beams upon the ocean2 the greater part of that heat is expended as force in overcoming the molecular attraction of water1 thus converting it to vapor1 and in raising that vapor to the higher regions of the atmosphere4 ,this heat-force1 or1 as we might call it1 'sunpower1' expended upon the earth1 amounts to thousands of millions of horse-power daily4 ,illustration3 ,,transmutation of ,,heat4 ,page #aac4 ,examples of the transmutation of force into heat abound everywhere4 ,a boy strikes his heel upon the stone pavement2 from the point of contact between the stone and the steel points in his boot heel sparks of fire fly out4 ,force is changed to heat so intense that particles of steel are set on fire4 ,savages who have no better methods of kindling fire rub dry wood together till the sticks ignite4 ,the force expended in overcoming the friction is changed to heat4 ,in the combustion of coal beneath the steam boiler we see both processes going on4 ,the atoms of carbon dash against the atoms of oxygen1 and the force of the collision generates the heat of the combustion4 ,this heat1 born thus of force1 is again transmuted to force1 and drives the engine and the machinery attached4 ,in our study of ,god's management of heat we shall constantly meet with these changes4 ,you will need1 therefore1 to study carefully this subject of latent heat4 ,dr4 ,joule1 of ,manchester1 ,england1 has discovered the ratio between heat and force1 that is1 the amount of force which by transmutation produces any given amount of heat4 ,the force of a one-pound weight which has fallen one foot is taken as the unit of force1 and the amount of heat which is required to raise one pound of water one degree is taken as the unit of heat4 ,by many and various careful experiments1 ,dr4 ,joule demonstrated that #ggb units of force are the equivalent of one unit of heat4 ,a pound weight falling #ggb feet1 or #ggb pounds falling one foot1 and then arrested1 produces heat sufficient to raise one pound of water one degree4 ,the result is the same whatever the method by which the force is expended4 ,if water be agitated or shaken1 if sticks of wood or iron plates be rubbed together1 if an anvil be struck with a hammer1 or if a bar of iron or copper be moved back and forth between the poles of an electromagnet1 the force expended is changed to heat4 ,you must remember1 however1 that force becomes heat only so far as the force is actually expended1 or used up so that it no longer exists as force4 ,these conclusions are supported by other beautiful experiments4 ',an electric current which1 by resistance in passing through an imperfect conductor1 produces heat sufficient to raise one pound of water one degree1 sets free an amount of hydrogen which1 when burned1 raises exactly one pound of water one degree4 ,again1 the same amount of electricity will produce an attractive magnetic force by which a weight of #ggb pounds may be raised one foot high4'--,youmans4 ,we conclude from experiments like these that heat1 mechanical force1 and electricity are interchangeable forces2 they may be transmuted the one into another4 ,by this principle of the transmutation of heat and mechanical force we explain the production of heat by compression and the loss of heat by expansion4 ,samuel1 you may state the fact upon this point4 ,if any substance be suddenly compressed1 answered ,samuel1 heat appears2 if it be expanded1 cold is produced4 ,since gases expand or yield to pressure so readily1 they furnish the best illustration of this principle4 ,the suddenness of the compression or expansion1 said ,mr4 ,wilton1 is a matter of no consequence4 ,the effect is the same whether the operation be sudden or slow1 but if the compression or expansion be slow1 the heat or cold generated is less apparent2 the heat is dissipated as fast as produced and the colder gas is warmed by the vessel which contains it4 ,ansel1 how shall we explain this8 ,i cannot explain it1 sir4 ,the explanation is very simple1 said ,mr4 ,wilton4 ,mechanical force is employed in the compression of the gas2 the force is expended and used up upon the gas1 and appears again in the form of atomic heat motion4 ,in the expansion of gases the operation is just the reverse2 the atomic heat motion is expended in producing expansion1 and hence disappears as heat4 ,the general principle is that no force can be expended in two ways at the same time4 ,one other point we must notice to-day1 that is1 specific heat4 ,what is understood1 ,ansel1 by this term1 specific heat8 ,the relative amount of heat which different substances require to raise their temperature through any given number of degrees4 ,that is right4 ,i think that you all must have noticed that it requires much more heat to raise the temperature of some bodies than others4 ,what an amount of heat is required to raise the temperature of water6 ,that heat which will raise one pound of water one degree will cause an equal increase of temperature in five pounds of sulphur1 or four pounds of air1 or nine pounds of iron1 or eleven pounds of copper1 or thirty pounds of mercury1 lead1 or gold4 ,this is what is meant by saying that one substance has a greater capacity for heat than another4 ,the specific heat of water is greater than that of any other known substance except hydrogen gas4 ,this fact1 taken in connection with its great specific latent heat and its poor conducting qualities1 renders it exceedingly important in regulating climate and moderating extremes of temperature2 of this you will be reminded very often as our lessons go on4 ,no law or principle determining the specific heat of the various elements and explaining the different capacities for heat has as yet been discovered4 ,it has been suggested that specific heat depends upon the number of atoms1 that it holds an inverse ratio to their combining numbers1 or1 what is the same thing1 a direct ratio to the number of atoms4 ,this would harmonize well with the dynamic theory of heat1 but the harmony between the specific heat of substances and the number of atoms is not sufficiently uniform to establish this supposition4 ,this completes our review of first principles4 ,i hope that this not very entertaining review of your academic studies has not wearied you of the very word heat and worn out your interest in examining ,god's management of heat before making a beginning4 ,i think1 said ,samuel1 that we are not in the habit of becoming disgusted with our studies4 ,you may expect1 continued ,mr4 ,wilton1 if the past has been interesting to you1 that the lessons to come will prove more interesting still4 ,next week we shall consider the abundant provision which the ,creator has made for warming the earth4 ,and let me say to you1 patient reader1 that if ,i had known that you were as familiar with the laws and principles of heat as ,ansel1 ,peter1 and ,samuel seem to have been1 this and the preceeding chapter would not have been written4 ,however dull this review may have seemed to you1 it was needful1 perhaps1 for others1 that they might understand the wonderful works of ,god which we shall now proceed to examine4 ,and1 reader1 do not forget that heat itself1 that subtle motion and mighty force1 with all its laws and principles1 is one of ,god's works4 ,already have we been looking at the ,creator's handiwork4 ,already have we been trying to trace out the thoughts of ,god as they are written in the ,bible of ,nature4 ,the thoughts of ,god are great and wonderful4 ,it has been useful and interesting to read thus far in this book written with the finger of the ,creator of worlds and of man1 even if we turn not another page4 ,,chapter ,,vi4 ,,management ,,and ,,sources ,,of ,,heat4 ,while the lessons which have been reported were going on1 the religious interest in the church was deepening4 ,mr4 ,wilton did not cease to make his sermons instructive1 but1 in addition to the instruction1 he made them more and more pungent and persuasive4 ,he aimed to gather up the impressions and convictions already wrought in the minds of his hearers and combine them for united and immediate effect4 ,he believed that this was to be a reaping-time4 ,mr4 ,hume was becoming interested1 not because he had been at church1 for he had not been there1 but the ,holy ,spirit of ,god was working upon his heart4 ,he was becoming uneasy in his unbelief4 ,for some reason1 he knew not why1 his opinions were becoming more and more unsettled4 ,he did not like to go to the house of ,god2 his self-will and pride of consistency rebelled against the thought of hearing and believing the gospel2 but he was restless and discontented away from the place of worship4 ,his associations with his infidel comrades grew distasteful4 ,his ,sundays were days of distress3 with his attention relieved from business cares1 thoughts of ,god and eternity pressed upon him1 and he could not escape them4 ,at length he determined to go and hear ,mr4 ,wilton again3 perhaps he should hear something which he could so positively reject as to set his mind at rest4 ,he went1 accordingly1 the next ,lord's ,day1 and heard a very impressive sermon4 ,the text for the forenoon was ,ps4 lxvi4 #e3 ,come and see the works of ,god3 he is terrible in his doing toward the children of men4 ,the sermon gave first a brief and rapid review of some striking displays of ,god's displeasure at the sins of men3 that ancient world of men whose thoughts were only evil continually he overwhelmed with the flood2 he burned with fire from heaven ,sodom and ,gomorrah1 ,zeboim and ,admah1 those lascivious and festering cities of the plain2 he sent his torturing and consuming plagues upon the ,egyptians1 and sunk the army of ,pharoah like a stone in the deep waters of the ,red ,sea3 they sank as lead in the mighty waters2 he caused the earth to open and receive ,korah and his adherents1 and bade his angel in one night to touch with death the thousands of ,sennacherib's army4 ,this record of divine wrath against evil-doers has startled the consciences of wicked men1 and will continue to startle them so long as the ungodly live upon the earth4 ,it is easy for unbelievers to call the word of ,god a record of fabulous wonders1 but that record lives and will live1 and its words assert their divinity by touching and burning the consciences of men as if they were tongues of fire4 ,but to the thoughtful man1 said ,mr4 ,wilton1 there is a manifestation of ,god's displeasure at sin even more impressive than these miraculous judgments4 ,the ,creator has built his wrath against sin into the very fabric of the universe2 he has written it upon the very atoms and elements of matter and of mind1 and graved it upon the 'nature of things4' ,the forces of ,nature are all instinct with holy wrath against ungodliness4 ,evil doing works out evil consequences by the regular course of nature4 ,babylon1 ,nineveh1 and ,tyre were great and prosperous1 and as mighty in wickedness as in commerce and war4 ,in the height of their prosperity ,god denounced upon them disaster and desolation1 and by the natural processes of evil their decay and destruction came upon them4 ,no miracle broke the harmony of their mighty march to decay and the silence of death4 ,great nations have perished1 but not till they became corrupt4 ,rome fell1 but luxury first gendered luxuriant vices1 and vices enervated her hardihood and undermined the defences of her courage4 ,no righteous nation ever perished4 ,no nation ever fell into decay till ripe in sin and ready for moral putrefaction4 ,but against wicked and corrupt nations wars and desolations are determined1 and the end thereof is with a flood4 ,the very forces of ,nature seem allied in firm compact with the laws of ,god1 ready with resistless hand to avenge their transgression and to visit evil upon evil-doers4 ,this steady march of all the forces of the world in bringing decay and wretchedness upon sinners is more impressive than any single desultory example of avenging wrath4 ,but perhaps an unbeliever replies1 ',not so2 there is a natural law of development1 decay1 and death1 apart from sin4 ,trees grow up1 become old1 and die4 ,men pass from childhood up to manhood1 and from manhood down to second childhood1 and return to the dust whence they came4 ,by a like principle1 nations pass through similar changes of development1 decay1 and desolation4 ,but in all this there is no manifestation of divine favor or disfavor4' ,this is narrow and false reasoning4 ,if a single great city had become corrupt while all the world beside remained righteous1 and ,god had denounced his displeasure upon it and had executed his wrath by sudden and tremendous judgment1 that one city standing out in single and solitary ungodliness and desolation1 who would deny1 who could deny1 that the fate of that unhappy city was a manifestation of divine displeasure8 ,if a second example were made of a second ungodly city1 would the expression of divine wrath be weakened8 ,nay2 every man would say that it is made stronger4 ,what if a third example be made of a third city8 ,what if every wicked city is made an example8 ,what if ,god embody his displeasure at evil-doing in the structure of the world1 and give to the very atoms of matter and the elements of mind such natures that by the working of their own proper forces1 without a miracle1 they shall bring pain and evil1 decay and death1 upon the ungodly8 ,what is this but writing his wrath against sin upon the earth and sky1 upon matter and the consciences of men1 declaring by this that till the heavens and the earth and the spirits of men be no more he will never withdraw his indignation8 ,this is what ,god has done4 ,the wicked man sets in motion the machinery which works out his own everlasting undoing4 ,his own hand sows the seeds of death1 and as those seeds germinate they strike their roots into his corruptions and draw their nourishment from his evil life4 ,thus do sinners go on 'treasuring up wrath against the day of wrath and revelation of the righteous judgments of ,god4' ,but remember that ,god has not left the world in these later ages without the testimony of wrathful judgments which ought to startle and alarm the consciences of the wicked like the fires of ,sodom4 ,let me give you what ,i suppose to be a true record of the fate which befell a band of bold blasphemers4 ,in that uprising of infidelity which took place near the close of the last century there was formed at ,newburg1 ,n4 ,y41 through the influence of a man known as ',blind ,palmer1' an association of infidels under the name of the ,druidical ,society4 ,the object of the society was to uproot and destroy revealed religion4 ,in pursuit of this object they descended to the most blasphemous mockery4 ,at one of their meetings they burned the ,bible1 baptized a cat1 partook of the bread and wine as appointed for the ordinance of the ,lord's ,supper1 and gave the elements to a dog4 ,then the wrath of ,god broke out upon them4 ',on the evening of that very day he who had administered the mock sacrament was attacked with a violent inflammatory disease2 his inflamed eyeballs were protruded from their sockets2 his tongue was swollen1 and he died before morning in great bodily and mental agony4 ,dr4 ,h----1 another of the same party1 was found dead in his bed the next morning4 ,d---- ,d----1 a printer who was present1 three days after fell in a fit1 and died immediately4 ,in a few days three others were drowned4 ,within five years from the time the ,druidical ,society was organized all the thirty-six original members--actors in the blasphemous ceremonies spoken of--died in some strange or unnatural manner4 ,two were starved to death1 seven were drowned1 eight were shot1 five committed suicide1 seven died on the gallows1 one was frozen to death1 and three died1 the record says1 accidentally4' ,be sure of this3 ,god has not left the world nor forgotten his judgments against his enemies1 neither is he tied up and hampered by the laws of ,nature4 ',god is angry with the wicked every day4 ,if he turn not1 he will whet his sword3 he hath bent his bow and made it ready4 ,he hath also prepared for him the instruments of death4' ,but remember1 also1 that ,god does not limit his expression of wrath to these natural agencies4 ,the smile of ,god beams direct upon the soul as the warm rays of the sun fall upon the cold earth1 and the frown of ,god throws a shadow which darkens the soul with the gloom of eternal death4 ,this discourse stirred the mind of ,mr4 ,hume in a wonderful manner4 ,the story of ,god's judgments upon wicked men and dissolute cities he had read many a time in his boyhood1 but the rapid review of them by ,mr4 ,wilton seemed to bring them up with a lifelike vividness4 ,and that view of the forces of ,nature1 as allied with the moral laws of ,god to work out wrath upon evil-doers1 was new to him1 but his own mind quick as thought suggested many more illustrations than ,mr4 ,wilton had time to give4 ,he remembered that all manner of vices--drunkenness1 lust1 devotion to gay1 sensual pleasures--bring ruin to men4 ,he had noticed that the saddest faces are those of worn-out lovers of pleasure1 and he knew that lovers of pleasure are very quickly worn out--that five years of sensuality will waste the powers of life more than fifty years of good work4 ,he knew also that infidels and blasphemers1 whatever else they might be1 were unhappy men1 and died joyless1 foreboding deaths4 ,he was not exactly angry1 but his heart rebelled against thus being held by the mighty power of ,god1 willing or unwilling1 and against the thought that even ,nature herself had conspired against him4 ,it seemed to him hard that he was born into such a world1 and that there was no escape from it4 ,he did not consider at the moment that ,god and his works were against him only because he was against ,god1 and that by submitting to ,god in loving obedience all the forces of ,god's world and ,god's providential government would turn in his favor--that all things work together for good to them that love ,god4 ,at length better thoughts came to him4 ,i must know1 he said to himself1 whether these things are so4 ,i have never examined the subject to discover the truth1 but have tried to find reasons for disbelieving the ,bible and denying the gospel4 ,i ought to look at the other side4 ,if ,nature and ,nature's ,god have blessings in store for the willing and the obedient1 why should not ,i know this and receive my share8 ,under the impulse of thoughts like these he formed the sudden resolution to join ,mr4 ,wilton's ,bible class--that is1 if he would receive him willingly1 of which he had no small doubt4 ,coming directly forward at the proper time1 he said to ,mr4 ,wilton3 ,i have learned what your class is studying1 and should like1 ,i hardly know why1 to join your class for a few ,sundays1 if you are entirely willing4 ,mr4 ,wilton1 of course1 did not know the exact state of ,mr4 ,hume's mind2 he did not know but that he came with a contentious spirit to bring up objections and propose hard questions2 but he felt certain that1 whatever his state of mind1 the ,spirit of ,god was bringing him to take this step4 ,he had prayed for him2 in prayer his soul had travailed in pain for him2 and he felt that by way of the throne of grace he had obtained a hold upon ,mr4 ,hume--that the ,holy ,spirit had bound a cord between them which could not be broken4 ,he believed1 therefore1 that1 whether he came penitent or angry1 good would result from his coming4 ,he gave him1 therefore1 a hearty welcome4 ,i am not only willing1 he said1 but very glad1 to have you come2 and as ,i know that you have kept yourself informed of the latest phases of modern science1 ,i hope we shall have your help in unfolding the subject which we are engaged in studying4 ,i think you will be able to do us good4 ,your kind welcome ought certainly to incline me to do anything which ,i can to help the interest of your study1 but ,i only ask the privilege of sitting with your class as a silent listener4 ,the ,sunday-school opened as usual1 and the classes entered upon their work4 ,you have come in1 ,mr4 ,hume1 at just the proper point in the progress of our lessons1 said ,mr4 ,wilton4 ,we have been preparing the way by a brief review of the laws of heat4 ,we have gone over the effects of heat2 the conduction1 radiation1 and convection of heat2 thermal reflection1 absorption1 and transmission2 specific and latent heat4 ,we have tried to form a conception of the existence and operations of heat according to the dynamic theory that heat is a mode of atomic motion4 ,this review would have had little interest to you4 ,we are now prepared to look at the goodness and wisdom of ,god in the management of heat4 ,we are not trying to prove the existence of a ,creator and ,governor--we are only looking at the mighty and wise works of that ,god in whom we already believe4 ,we shall find the works of ,god planned and wrought out with wondrous skill1 and that wonderful skill is employed in the interest of goodness4 ,god has planned and wrought for the benefit of his creatures4 ,his wisdom and goodness are exhibited on the grandest scale and in gigantic proportions4 ,this is all that is needed practically to demonstrate the existence of ,god4 ,a good conscience does the rest4 ,being once assured that there is a ,creator1 a good conscience leaps to the conclusion that we ought to obey and serve him4 ,nay1 the very work and existence of a conscience implies a divine ,lawgiver and ,ruler4 ,to a good conscience a ,god is a necessity4 ,but as we are not now attempting to show that there is a ,god1 but to study his works1 we will pass this point4 ,with respect to the subject before us1 let us first notice that heat is a necessity to the world and to man1 and that ,god has made ample provision for that need4 ,what the condition of the world would be without heat we can only conjecture4 ,in the polar regions a natural temperature of seventy degrees below zero has been observed4 ,at this temperature all the water upon the globe would turn to ice hard as adamant2 all vegetation would cease1 and with the disappearance of vegetable life all animal life must perish4 ,the whole earth would be a frozen1 lifeless1 silent waste in the midst of silent space4 ,some lines in ,byron's picture of universal darkness would fitly describe the state of the world3 ',the waves are dead1 the tides are in their grave1 ,the winds are withered in the stagnant air1 ,and the clouds are perished4' ,this description would be no figure1 for motion as well as life depends upon heat4 ,yet seventy degrees below zero is but the beginning of cold4 ',by mixing liquid protoxide of nitrogen with bisulphate of carbon in a vacuum1 ,m4 ,natterer produced a temperature of two hundred and twenty degrees below zero4' ,at this temperature some of the so-called permanent gases--as carbonic acid1 chlorine1 and ammonia--can be compressed into liquids1 and it is believed that in the complete absence of all heat all the gases would become solids4 ,but by the agency of heat the world teems with active life4 ,vegetation clothes the earth with a garment of beauty2 and earth1 air1 and sea swarm with living creatures full of enjoyment4 ,this great need of the world is bountifully supplied4 ,the power and wisdom of ,god are employed in producing happiness4 ,this1 however1 is but a part of the benefit which heat confers upon the world4 ,the chief inhabitant of the earth is man1 and man was created for something higher than bare existence4 ,he was created for civilization and culture4 ,the savage state is not1 as some self-styled philosophers dream1 the natural state of man4 ,nothing is so much against ,nature4 ,the natural state is that condition in which he attains the fullest development4 ,let a brute be placed in so unfavorable conditions that his growth is dwarfed and his natural instincts are not called into exercise1 and no one would look upon that as a natural state4 ,but man1 wild1 uncultured1 undeveloped1 is spoken of as being in his natural state4 ,there could be no greater mistake4 ,culture and civilization are according to ,nature1 but culture and civilization require that man should get the mastery of ,nature and subdue her forces4 ,till man gets the victory over the forces of this rough world1 he spends a precarious existence in a hard struggle to gain a meagre support for his animal life4 ,but when once science brings art1 and the mastery of ,nature is gained1 man can rise into culture and beauty4 ,opportunity is given for development4 ,he blossoms into greatness and strength4 ,ideal and spiritual ends take the place of mere subsistence4 ,but by what agency does man achieve the mastery of ,nature8 ,by the agency of heat4 ,by the aid of heat man subdues the world4 ,heat brings the lustrous metal from its native ore2 heat fashions the metal into a thousand shapes for the use of men2 heat reigns as king in the curious processes of the chemist's laboratory1 and the laboratory is the mother of all those modern arts which bless and beautify human life4 ,by heat man prepares his food2 by heat he drives his machinery2 by heat he outstrips the flight of the winds2 by heat he turns winter into summer and in his own dwelling makes for himself a perpetual springtime4 ,for these purposes of human comfort and culture1 ,god has provided generous stores of heat and placed them under man's control4 ,he has placed in man's hands the means by which he can generate a heat which devours the hardest metals like stubble and a cold greater by far than ,nature ever produces4 ,we see that the ,creator has provided for man as a being susceptible of culture and development1 as a being of soul and sentiment1 of spirit and aspiration4 ,god has fitted the world to be the dwelling-place of spiritual beings like man4 ,i beg your pardon1 said ,mr4 ,hume at this point1 that the first word ,i speak in your class should be a question which amounts to an objection4 ,i shall be glad1 said ,mr4 ,wilton1 to hear your question1 even though it be an objection4 ,i will also answer it if ,i can4 ,i wished to ask why it is1 if ,god designed to provide for man's wants1 that man can supply his wants1 especially his higher wants--the wants of his intellectual and spiritual nature--only with the greatest difficulty and toil8 ,the brutes supply their need with comparative ease1 but man with boundless thought and labor4 ,your question is an important one1 and deserves an answer4 ,for myself1 ,i look upon the fact to which you refer as one of the many points in which this world is adapted to human needs4 ,man is put in a condition which requires boundless thought and toil for the supply of his higher wants just because he possesses a nobler nature and such thought and exertion are needed for its development4 ,which is the more desirable condition for a young man to be placed in--one in which his every wish is anticipated and his every aspiration is gratified without exertion on his own part1 or one in which opportunity and means are furnished for self-help1 one in which he can supply his wants and satisfy his aspirations only by the exercise of his best abilities8 ,which will encourage the larger manliness and nurture the higher culture and strength8 ,he who has no need for exertion rises at best only to a soft and feeble luxury1 without mental vigor or moral force4 ,what does man need besides scope and reward for exertion8 ,effort and struggle are necessities of our nature4 ,this is especially true of man's higher faculties4 ,human greatness and goodness are not created by a word3 they must be developed by exertion4 ,for this reason ,god has made exertion necessary1 and as much more necessary with man than with the brutes as his culture is more the result of voluntary1 intelligent exertion4 ,does this explanation seem to you satisfactory1 ,mr4 ,hume8 ,i have no fault to find with it2 ,i must think of it4 ,very well1 then2 if no other one has a question to ask1 we will look at another subject4 ,we will survey the storehouses of heat which ,god has prepared for warming the earth4 ,samuel1 you may name the first great source of heat4 ,i think1 sir1 that the sun is the chief source of heat4 ,we certainly receive the larger part of our heat from the sun4 ,no one can doubt this4 ,so much of our heat comes from the sun that the temperature of the earth varies according to the sun's heat1 as if that were the only supply4 ,if but a fleecy cloud pass between the sun and the earth1 we feel a decided change of temperature4 ,a few hours less of sunshine each day1 and a few degrees more of inclination to the sun's rays1 change summer to winter and make the difference between the torrid and the frigid zones4 ,withdraw the heat of the sun altogether1 and the whole world would become a desert of frozen death4 ,what is the cause of the sun's heat8 asked ,peter4 ,you have asked a question which ,i cannot answer1 and which no man can answer4 ,the most careful and patient observations have been made to discover if possible the constitution of the sun2 learned and curious conjectures have been brought forward to explain the source of its heat2 but the positive results have not been very large4 ,it is certain that the sun is a globe revolving upon its axis in a period of twenty-five days1 nine hours1 and thirty-six minutes4 ,this is known by the motion of dark spots upon its surface4 ,the appearance of the sun as seen through a telescope is that of a globe of fire1 its surface often in a state of violent agitation and flecked here and there with dark1 irregular1 changeable spots4 ,these spots are sometimes of enormous dimensions--thirty thousand or fifty thousand miles in diameter4 ,they present a dark centre with a narrow border or penumbra of lighter shade4 ,to account for these spots1 it has been conjectured that the body of the sun is dark1 but surrounded by a double envelope of clouds1 the outer layer of which is intensely luminous4 ,openings in such enveloping clouds would present an appearance like the spots upon the sun4 ,according to this supposition1 the heat and light of the sun proceed1 not from the body of the sun1 but from this luminous enveloping cloud4 ,but granting that this supposition is true1 it gives no explanation of the origin of the sun's heat4 ,laplace conjectured that the sun is a globe of fire in a state of violent1 explosive conflagration1 and that the spots are enormous crater-like caverns in its surface4 ,newton conjectured that comets falling into the sun and being consumed feed the solar fires and maintain its temperature4 ,the reception of the dynamic theory of heat has led to the revival1 in a modified form1 of this conjecture of ,newton4 ,it is suggested that meteors or meteoric matter falling into the sun generates its heat by the force of concussion4 ,to show that the intense heat of the sun might be thus generated1 elaborate calculations have been made4 ,it has been demonstrated that if the sun were a solid mass of anthracite coal1 its combustion would maintain its heat at its present rate of emission only five thousand years1 while the falling of the planet ,jupiter into the sun would generate an equal amount of heat for thirty-five thousand years4 ,a lump of coal falling from the earth to the sun would produce three thousand times more heat by the concussion than by its combustion4 ,the nearest approach that has been made1 of an exact and scientific kind1 toward determining the constitution of the sun's surface has resulted from an examination of the solar spectrum4 ,a ray of light1 by passing through a triangular prism of glass1 is1 as you know1 divided into its elements1 or constituent colors4 ,the ray of light is spread out like a half-open fan4 ,this divided and expanded ray1 thrown upon a screen1 is called the spectrum4 ,an examination of the solar spectrum by a microscope shows certain fine dark lines across it4 ,the lines are invariably the same in their position and grouping4 ,the spectrum of the stellar light is found to differ from that of the solar light1 and the light of one star differs from that of another star4 ,light from incandescent metallic vapors gives bright lines across the spectrum4 ,each metal has its own number1 position1 grouping1 and color of these spectral lines4 ,by comparing the solar spectrum with the spectra of the various metals--the processes are curious and the explanation difficult to be understood--corresponding lines are discovered1 and the conclusion is reached that the sun's atmosphere contains the vapors of several of our well-known metals1 as iron1 nickel1 sodium1 potassium1 and others4 ,this is a most curious and marvelous scientific feat1 to make an approximate chemical analysis of the sun and stars by means of their light4 ,the conclusions1 however1 seem trustworthy4 ,can you tell us1 ,ansel1 whether the earth receives heat from the moon and stars8 ,i cannot1 sir4 ,i should be glad1 ,mr4 ,hume1 to have you instruct us upon this point4 ,in regard to the fixed stars1 answered ,mr4 ,hume1 counting them as the remote suns of other planetary systems1 we must believe that they radiate more or less heat upon the earth2 some indeed have extravagantly maintained that we receive from them nearly as much heat as from the sun4 ,the heat received from them is so small that we perceive no difference whether they be hidden1 or shine with their utmost brilliancy4 ,i do not know that investigations have been made to determine scientifically their exact thermal influence upon the earth4 ,but little more can be said about the heat of the moon4 ,the light of the full moon1 concentrated by a two-foot burning-glass and thrown upon the bulb of the most delicate thermometer1 produces no perceptible effect4 ,by means of the electroscope or galvanometer1 it is said1 however1 that the moon's heat has been detected4 ,at a late scientific convention held in ,chicago1 ,prof4 ,elias ,loomis read a paper1 in which he stated that ,mr4 ,harrison of ,england1 by a comparison of observations made for sixteen years at ,greenwich1 nine years at ,oxford1 and sixteen years at ,berlin1 has discovered that the moon exerts a sensible influence upon the temperature of the earth1 the highest temperature occurring from six to nine days after the new moon and the lowest about four days after the full moon4 ,the conclusion1 the opposite of what we should naturally expect--the higher temperature occurring when the enlightened face of the moon is turned from the earth--was explained by supposing the moon's heat to be dark heat which would be absorbed by the vapors and the clouds1 and thus tend to warm and dissipate them4 ,by the dispersion of the clouds1 the radiation of heat from the earth's surface would go on more rapidly and the temperature would fall4 ,according to this explanation1 the lunar heat reduces instead of raising the temperature of the earth4 ,the difference of temperature due to the moon's influence ,mr4 ,harrison believed to be two and a half degrees4 ,upon extending his calculations through forty-three years of observations made at ,greenwich1 he found the difference reduced to about one degree4 ,as for myself1 ,i confess myself still a skeptic touching the supposed influence of the moon upon temperature4 ,upon that subject1 ,i think1 said ,mr4 ,wilton1 that we must wait patiently for more light4 ,the popular superstitions which refer sickness and health1 and every kind of good or evil fortune1 to the benign or malignant influence of the moon1 we1 of course1 must reject4 ,samuel1 will you name the second chief source of heat8 ,i am obliged to answer as ,ansel answered just now--,i cannot tell4 ,the enormous amount of wood and coal burned amounts to something1 but this can have very little effect upon the temperature of the earth4 ,the second great store of heat is the internal heat of the earth1 said ,mr4 ,wilton4 ,the importance of this store of heat we can easily understand by considering that the earth is a mass of molten mineral matter cooled and hardened upon the surface4 ,the crust upon which we live is warmed from beneath by an ocean1 or rather a globe1 a world1 of glowing molten rock4 ,deep excavations have been made in mining operations1 and artesian wells have been bored to still greater depths--as deep as two thousand1 three thousand1 or thirty-five hundred feet4 ,the heat of the sun penetrates not more than seventy-five or a hundred feet2 below that depth the temperature of the earth remains the same throughout the year4 ,below the point of constant temperature the heat of the earth is found to increase regularly and constantly4 ,the rate of increase varies in different regions1 but the average rate is about one degree of temperature for each fifty or sixty feet of descent4 ,from this rate of increase it is easy to calculate the temperature at any given depth4 ,at a depth of less than two miles water would boil4 ,at twelve miles in depth the rock becomes incandescent4 ,at twenty-two miles silver melts1 at twenty-four miles gold melts1 and at thirty-five miles cast iron becomes liquid4 ,volcanic eruptions also demonstrate the existence of immense masses of molten rock in the interior of the earth2 and we can account for the existence of volcanoes only by supposing that they now communicate or once communicated with the deep interior heat of the earth4 ,the thickness of the earth's crust is1 however1 a matter of conjecture4 ,the melting point of different substances rises as the pressure upon them increases1 and as the density of the rock increases its conducting power becomes greater4 ,the crust of the earth1 therefore1 may be fifty miles in thickness1 or it may be one hundred miles or two hundred or three hundred miles4 ,the effect of this internal heat in maintaining the temperature of the earth must be very great4 ,i want to ask1 said ,peter1 how this internal heat came to exist1 and how it is maintained8 ,this1 like your former question1 is altogether beyond our knowledge4 ,all that we certainly know is that ,god made it thus4 ,the process of creation1 if indeed ,god did not create the earth by a word1 without a process1 is a matter of sublimest and most venturesome conjecture4 ,according to the opinion of some1 the elements of which the earth is composed were created separate and uncombined1 and were suffered afterward to unite by their chemical affinities4 ,this chemical combination would be nothing else than a tremendous conflagration1 and the result would be the most intense heat of which we can form a conception4 ,others have dreamed of a 'fire-mist' created of ,god and by some means condensed into worlds4 ,the temperature of the earth is maintained1 so far as we know1 only by the poor conducting quality of the enveloping crust preventing its cooling4 ,at the present rate of radiation1 millions of years would be required to render the change of temperature perceptible4 ,what is the third great natural source of heat8 ,i will ask ,mr4 ,hume4 ,mechanical action1 or force transmuted to heat4 ,will you please explain this8 ,strictly speaking1 said ,mr4 ,hume1 this is not to be counted an original source of heat4 ,but heat is used in the production of winds and waves1 the flow of rivers1 and all the ceaseless activities of the world1 and this force reappears from time to time transmuted again to heat4 ,whenever in the friction of air and of water1 in the dashing of matter against matter and force against force1 motion and force seem to be lost1 heat is produced4 ,the water of the sea after long storms is said to be sensibly warmed4 ,we can appreciate the amount of heat generated in this manner only by considering in how many thousand ways force is meeting force and motion is destroyed4 ,all this lost motion--lost as sensible motion--reappears as atomic motion1 that is1 as heat4 ,such heat has been applied to artificial uses4 ,heat generated by the friction of iron plates ground together has been used for heating buildings4 ,and this transmutation of living force and heat1 added ,mr4 ,wilton1 is but one of many illustrations of ,god's economy in the management of heat4 ,nothing is wasted4 ,the voices of ,nature all echo the words of ,jesus3 ',gather up the fragments1 that nothing be lost4' ,the fourth source of heat is chemical action4 ,what is the chief form of this which is used for the production of heat8 ,samuel may tell us4 ,combustion1 ,i think1 sir4 ,that is right2 and the most common form of combustion is the combination of carbon with oxygen4 ,this is commonly employed1 not because it generates the most intense heat1 but because carbon exists so abundantly1 and is the most available and the cheapest4 ,the most common form of carbon is wood and coal4 ,this is that storehouse of heat which ,god has placed in man's keeping4 ,without this the larger part of the earth's surface would be uninhabitable4 ,this renders culture and civilization possible4 ,without it the arts could have no existence4 ,the key of this storehouse of heat ,god has given to man1 so that he may enter in and use its treasures at his pleasure4 ,in the finer arts where very great heat is required1 hydrogen is used in place of carbon4 ,jets of oxygen and hydrogen gas thrown together constitute what is called the oxy-hydrogen blowpipe1 and generate the intensest heat which can be produced by man4 ,another source of heat not often mentioned is electrical force4 ,this1 like mechanical force1 may be transmuted into heat4 ,an electric current sent through an insufficient or poor conductor heats it1 and1 if the current be sufficiently strong1 consumes it4 ,thus lightning-rods are sometimes melted and buildings set on fire4 ,these1 then1 are the natural reservoirs of heat3 #a1 the sun and other heavenly bodies2 #b1 the internal heat of the earth2 #c1 living force1 or motion2 #d1 chemical action2 #e1 electric force4 ,we can hardly over-estimate the abundance of these natural supplies of heat4 ,the world is warmed on the most munificent scale4 ,the earth receives from the sun heat sufficient to boil three hundred cubic miles of ice water per hour1 and the whole sum of the sun's heat would boil #gjj1jjj1jjj1jjj cubic miles of ice water in the same time1 that is1 the heat radiated by the sun would boil a mass of ice water of the size of our globe in twenty-five minutes4 ,the amount of carbon provided by the ,creator is enormous beyond conception4 ,vast regions of country are covered with dense forests1 but the fuel from the forests is but a handful in comparison with the fuel stored up in coal-beds below the surface of the earth4 ,mr4 ,mitchel estimated the extent of the coal-beds of a portion of ,europe as follows3 ,great ,britain1 #ab1jjj square miles2 ,spain1 #cejj2 ,france1 #agjj2 ,belgium1 #eahj4 ,mr4 ,r4 ,c4 ,taylor has made a like estimate for ,north ,america1 giving to ,british ,america #ah1jjj and to the ,united ,states #acd1jjj square miles4 ,these estimates1 you will notice1 say nothing of ,asia1 ,africa1 ,south ,america1 or the islands of the sea1 and include only the smaller part of ,europe4 ,in the ,united ,states1 also1 new coal-fields are constantly discovered4 ,the supply of carbon for fuel seems exhaustless4 ,in the ,british islands about #ajj1jjj1jjj tons of coal are mined annually4 ,at this rate the known supply would last for a thousand years4 ,in the ,united ,states the supply has no known limit4 ,you will keep in mind that this supply of heat is also a supply of mechanical force4 ,the coal-fields are an exhaustless storehouse of heat and power4 ,they warm the dwellings of man and drive millions of engines working with the strength of ,titans for human welfare4 ,in this bountiful supply of heat to warm the earth and serve human needs must we not see a kind design on the part of the ,creator8 ,god has provided that which the world needs4 ,he has provided without stint or limit4 ,the general heating of the globe he accomplishes by his own power4 ,he has provided for human culture1 development1 and happiness by placing stores of heat under man's control4 ,he has furnished scope and means and encouragement for achieving greatness and goodness4 ,he has put man in the condition which a wise father would desire for his son4 ,in our next lesson we will look at the preservation and distribution of heat1 some of the primary elements and arrangements upon which the temperature of the earth depends4 ,,chapter ,,vii4 ,,preservation ,,and ,,distribution ,,of ,,heat4 ,another ,lord's ,day comes1 and the members of the class are1 as usual1 all in their places4 ,they find the subject increasing in interest after leaving the review of the laws and principles of heat4 ,a week ago1 said ,mr4 ,wilton1 we looked at the chief sources of heat4 ,these are the sun1 the internal heat of the earth1 chemical action1 in which combustion is most important1 electrical action1 and mechanical action1 or 'living force4' ,the amount of heat furnished from these sources is above all comprehension4 ,the ,creator seems bountiful even to prodigality in supplying heat for the needs of the world and the uses of man4 ,but with all this largeness of supply the provision would prove wholly inadequate if it were not prudently husbanded and all the avenues of waste carefully closed4 ,men of ample incomes sometimes come to want from too free expenditure4 ,their incomes are large1 but their expenses are larger4 ,so it would prove in respect to heat if ,nature were not as prudent in saving as she is bountiful in providing4 ,will some one mention some of the general methods by which the waste of heat is prevented8 ,no one answered4 ,mr4 ,hume did not think it best to put himself forward in answering questions1 and therefore answered only when personally addressed4 ,the others were silent because they had nothing to say4 ,i see that ,i shall have to suggest the answer4 ,ansel1 what part of the atmosphere is warmest8 ,the bottom1 ,i suppose1 for the higher a man goes up upon the lofty mountains or in a balloon1 the colder he finds the air4 ,that is right2 and we need to ascend only about three miles1 even in the tropics1 to reach the region of perpetual snow1 while in the polar regions the line of perpetual freezing comes down to the sea level4 ,what would be the effect1 ,ansel1 if the atmosphere were as warm1 or warmer1 at the top than at the surface of the earth8 ,how would that affect the rate of radiation from the earth8 ,it must1 of course1 increase the radiation very much4 ,with the temperature twenty or fifty or seventy degrees below zero1 the radiation must be very little4 ,by some means1 then1 the atmosphere is kept warm at the surface of the earth and cold in the higher regions1 and in this manner the radiation of heat into open space is prevented4 ,this is accomplished notwithstanding that the top of the atmosphere is nearer the chief source of heat1 the sun4 ,this would be no very easy problem if its solution were left to human ingenuity4 ,the explanation is very simple1 however1 when once suggested4 ,the atmosphere is diathermic1 that is1 it permits the luminous heat from the sun to pass directly through it without heating the air1 but the solid earth stops the heat by absorption1 and is warmed by it4 ,the warm surface of the earth imparts1 in turn1 its heat to the atmosphere resting upon it4 ,this warm air1 being expanded by the heat received1 becomes lighter than the cold air around1 and rises1 or rather is forced1 upward by the greater weight of the colder air4 ,but as it rises and the pressure of the air is diminished it expands still further4 ,by this expansion its sensible heat becomes latent1 that is1 the heat is transmuted into force1 and1 as force1 is incapable of being radiated4 ,in this manner radiation from the upper surface of the atmosphere is greatly hindered and waste of heat is in a good degree prevented4 ,in respect to this heating of the atmosphere from the surface of the earth1 a layer of clouds sometimes forms a kind of second surface which receives the sun's rays and warms the air above4 ,a few years ago ,i saw a balloon ascension in ,providence1 ,r4 ,i4 ,the day was bleak and chilly1 and the sky entirely covered with clouds4 ,the aeronauts were expecting a chilly voyage4 ,the balloon shot like an arrow toward the zenith1 and in five minutes was completely hidden by the clouds4 ,but to the surprise of the voyagers of the sky1 on passing through the clouds their thermometer rose ten degrees4 ,this1 doubtless1 must very often be the case4 ,the air above the clouds must often be warmer than that below4 ,i think you all must have noticed illustrations of this principle on a small scale4 ,have you not seen that snow and ice often melt around straws and sticks1 the snow or ice remaining still frozen at a little distance1 as if the sticks and straws were warm and had melted them8 ,have you not seen a dark-colored board covered with ice1 and the ice remain firm till the sun shone upon it1 and then the ice melt upon the under surface1 leaving the upper surface unaffected8 ,i have seen such things a great many times1 said ,peter1 and wondered what the reason was4 ,the reason is that ice is diathermic4 ,heat passes through the ice without warming2 but when the rays of heat fall upon the stick or stone or board1 the heat is absorbed1 the dark body is heated and in turn warms and melts the ice4 ,in the same manner the atmosphere is warmed4 ,the heat-rays of the sun pass through the atmosphere and fall upon the surface of the earth2 the earth is warmed1 and in turn warms the air resting upon it4 ,the gases and watery vapor contained in the air also hinder the radiation of heat from the earth4 ,pure atmospheric air is perfectly diathermic to both luminous and dark heat1 and vapors and gases are also diathermic to luminous heat4 ,but to dark heat some of the gases are almost impenetrable4 ,ammonia stops dark heat almost completely4 ,in a smaller degree watery vapor does the same4 ,gases and vapors thus serve as blankets to keep the earth warm4 ,the heat of the sun1 being luminous heat1 penetrates the atmosphere with its vapors and foreign gases1 and falls upon the earth almost without loss1 but1 being absorbed by the earth1 it becomes dark heat1 and cannot be radiated back through the same gases and vapors4 ,vapor serves thus as a valve3 it admits the heat of the sun to the surface of the earth1 but prevents its escape4 ,prof4 ,youmans calls watery vapor the barb of heat2 it catches the heat of the sun and holds it fast4 ,who can sufficiently admire the simplicity of these arrangements for preventing the radiation of heat into the stellar regions8--and their efficiency is no less admirable than their simplicity4 ,arrangements like these show that the ,creator had a definite object in view1 and that object is benevolent4 ,for the advantage and enjoyment of the inhabitants of this world these arrangements were made4 ,we ought at this point to look at those adjustments by which the earth receives just the amount of heat needed to maintain the requisite temperature4 ,the importance of maintaining some certain average temperature cannot be over-estimated4 ,every animal and plant has its own habitat--that is1 its natural dwelling-place or location--outside of which it perishes or maintains a stunted and precarious life4 ,the habitat of animals and plants depends in a very great degree upon temperature4 ,what a panorama would be seen if we could fly like a bird from the equator to the poles1 and look down upon the ever-changing animal and vegetable life as we pass6 ,how the luxuriant vegetation and flaunting colors of the tropics would shade off into the scantier vegetable life and more sober hues of the temperate zones1 and these in turn die out and disappear in polar barrenness6 ,we should see the lion and tiger give place to the bear and the wolf1 the elephant and camel to the ox and horse1 and these to the white bear and reindeer4 ,this sublime panorama we see1 in miniature1 in ascending lofty mountains in the tropics4 ,around the base of the mountain flourish the rich and various productions of the torrid zone2 a few thousand feet of elevation bring us among the productions of the temperate zones4 ,the most valuable fruits and grains thrive4 ,then vegetation becomes scanty and stunted1 and at last disappears4 ,the top of ,mt4 ,washington1 #fbcd feet high1 in latitude forty-four degrees1 is as bare of trees and plants and every form of vegetation as the north pole4 ,the fitting temperature is almost as necessary to the animal tribes as to vegetable life4 ,animals which are native to the tropics do not thrive in colder countries1 or if the difference of temperature be very great1 they perish4 ,a change from a cold to a warm region is equally disastrous4 ,man indeed transfers animals from their natural habitat by protecting them from the extremes of temperature1 but this is1 of course1 no exception to the general principle of which ,i am speaking4 ,a change of only a few degrees in the mean annual temperature would render this earth a hard place for even the human race to subsist4 ,but the temperature of the earth depends upon many a wise adjustment--how many1 we cannot tell4 ,will you tell us1 ,samuel1 the first adjustment or arrangement upon which the temperature of the earth depends8 ,it must depend chiefly ,i think upon the intensity of the sun's heat4 ,whether or not that be the chief adjustment by which the right temperature is secured1 it is at least a very important item4 ,the intensity of the sun's heat must1 of course1 be considered in connection with its distance from the earth4 ,the distance of the sun is no less important than the power of his rays2 indeed1 in one sense1 it is more important1 for if the intensity of the sun's heat were doubled1 the temperature of the earth would be increased only twofold2 whereas1 if the earth were brought to one-half its present distance from the sun1 the heat would be increased four times4 ,heat being one of the radiant forces1 its intensity diminishes in proportion to the square of the distance through which it acts4 ,if the earth were #aij1jjj1jjj of miles from the sun instead of #ie1jjj1jjj1 as it now is1 the force of the sun's rays would be diminished fourfold4 ,the ,creator has so fixed the distance of the earth and sun1 and the power of the sun's heat1 as to give to this world a temperature suited to its various inhabitants4 ,the temperature of the earth has also some dependence upon our atmosphere4 ,can you tell us1 ,ansel1 how the temperature of the earth is affected by the atmosphere8 ,you have already told us that the atmosphere is diathermic1 allowing the heat of the sun to fall upon the earth almost undiminished in force4 ,if the air were so constituted as to intercept the sun's rays1 it is plain that the earth would receive less heat4 ,this adaptation of our atmosphere to transmit the sun's rays1 said ,mr4 ,wilton1 is more subtle than it appears at first sight4 ,it is not merely a matter of depth and density1 though those are important considerations1 nor is it merely a question of the elements of which the atmosphere is composed4 ,simple gases are diathermic4 ,the atmosphere is therefore made up of two simple gases1 oxygen and nitrogen1 not chemically combined1 but mixed together4 ,compound gases intercept the passage of heat4 ,ammonia1 composed of hydrogen and nitrogen chemically united1 almost wholly stops it4 ,even ozone1 which is nothing but oxygen in a changed or allotropic state1 is not diathermic4 ,the diathermic quality of the air depends1 then1 not only upon the fact that it is composed of simple elements mingled1 but not chemically joined1 but also upon the state1 or condition1 of those simple elements4 ,another point deserves attention4 ,oxygen is an element having a wide range of very strong and active affinities4 ,it is ready to unite with every known substance1 fluorine excepted4 ,what if some other equally active element were mingled with oxygen to form the atmosphere8 ,what if1 in place of nitrogen1 vapor of sulphur were substituted8 ,what if hydrogen were put in the place of nitrogen8 ,the two elements would combine in sudden combustion or explosion1 and the atmosphere itself would perish4 ,but nitrogen is a substance so sluggish and inert that it can be brought into union with oxygen only by indirect processes4 ,because the air is composed of one so inert element as nitrogen1 the atmosphere is preserved1 and1 what is almost as important1 it is kept1 as it now is1 composed of simple elements1 and hence diathermic4 ,if our atmosphere were a compound gas1 the world would perish with cold4 ,the temperature of the earth depends also upon certain qualities of the earth's surface4 ,i should be glad to have ,mr4 ,hume explain this4 ,i suppose1 answered ,mr4 ,hume1 that you refer to the qualities of the earth as an absorbent and conductor of heat4 ,the earth must needs have the capacity of receiving and retaining the heat which falls upon it from the sun4 ,if the earth's surface were polished and brilliant1 the heat of the sun would be reflected into space as from the surface of a mirror1 and very small advantage would the earth receive from the solar heat4 ,a dark soil absorbs heat more readily than a soil of lighter color1 and a wet soil1 on account of the high specific heat of water1 requires more heat to raise its temperature than a dry soil4 ,the mineral elements of the soil and its compactness or porosity also help to make up its capacity for receiving and retaining heat4 ,the color and constitution of the soil sometimes go far toward making the climate of a region4 ,the conducting qualities of the earth's crust in its profoundest depths also must be taken into account4 ,if the crust of the earth were composed of silver1 or any other substance of like conducting quality1 and the interior of the earth were molten rock1 as it now is1 the interior heat would be so rapidly conducted to the surface that everything upon the earth would be consumed4 ,upon so many circumstances wisely adjusted and nicely blended1 said ,mr4 ,wilton1 does the temperature of the earth depend4 ,the intensity of the sun's heat1 the dimensions of the earth's orbit1 the constitution of our atmosphere in the subtlest qualities and relations of its elements1 and the material1 structure1 and color of the earth's crust1--on all these and many other things which ,i cannot stop to mention depends the temperature needful for the well-being of the inhabitants of this globe4 ,i beg your pardon1 ,mr4 ,hume1 but allow me to ask whether such a combination of agencies and conditions1 uniting to work out good for man1 does not seem to you quite superhuman and worthy of a wise and good ,creator8 ,i cannot deny it1 sir1 he replied2 ,i am not prepared to make any objections4 ,there are many things painful to man in the vicissitudes of heat and cold1 and if ,i were to make a world1 ,i suppose ,i should leave them out1 or perhaps make the world upon a very different plan4 ,but ,i am not prepared to affirm that any changes which ,i could make would be improvements1 though ,i have thought until recently that more of knowledge and power1 and perhaps more of chance1 too1 than of wisdom and goodness1 were displayed in the works of ,nature4 ,but ,i must confess my opinion has been much modified4 ,i think your change of mind is in the right direction1 and ,i am glad that it is so4 ,we learn the secrets of ,nature and appreciate her spirit much better when we come as reverent questioners than when we come with preconceived notions and a patronizing air4 ,i can well understand your feelings and state1 for ,i myself have traveled over the same ground4 ,my eyes were once dazzled with the glories of science2 ,i worshiped at the shrine of natural laws4 ,but ,i have learned that ,god is greater than ,nature1 the ,creator is mightier than the creation4 ,nature has no mind or purpose apart from the plan and will of the supreme ,architect and ,ruler1 and this inner plan and purpose of ,nature is seen only in the government and discipline of our sinful race4 ,i shall greatly rejoice for you and with you if you shall go on to the same end which ,i have reached4 ,i shall much rejoice if ,i reach some satisfactory and peaceful conclusion4 ,to understand the management of heat1 said ,mr4 ,wilton1 we must take note of the differences and fluctuations of terrestrial temperature4 ,the sources of heat are constant4 ,the sun sends out its flood of heat uninterrupted and changeless for ever4 ,the internal fires of the earth give an even inward heat4 ,mechanical and chemical agencies are active everywhere4 ,these sources of heat do not fluctuate1 flaming up and dying away1 yet temperature is the most variable of all inconstant things4 ,in passing from equator to pole we go from torrid to frigid1 from everlasting summer to everlasting winter4 ,and not only this1 but in the same region the temperature never remains the same for even twenty-four hours4 ,the thermometer may pass from forty degrees above to thirty below zero in a very few hours4 ,we must first consider the agencies by which these inequalities are produced4 ,ansel may mention the first of these4 ,the shape of the earth1 said ,ansel4 ,how does the form of the earth operate to produce inequality of temperature8 ,the earth is a sphere1 and the rays of the sun fall upon it in nearly parallel lines4 ,upon the centre of the hemisphere which is turned toward the sun the rays fall perpendicularly1 the sun is directly over head1 while toward the edges of the hemisphere1 on account of the curvature of the earth's surface1 the rays fall more and more slanting1 as if the sun were sinking toward the horizon4 ,what is that inequality of temperature which is produced by the shape of the earth8 ,the five zones1 answered ,peter4 ,this subject is so well understood1 said ,mr4 ,wilton1 that ,i need not spend time in explaining it4 ,every boy knows the difference between setting his wet slate before the fire to dry so that the heat will fall squarely and perpendicularly upon it and placing it edgewise to the fire4 ,upon the torrid zone the sun shines perpendicularly1 upon the temperate zones obliquely1 and upon the frigid zones still more obliquely1 and during a part of the year the sun is entirely hidden4 ,in proportion as the rays of heat fall obliquely1 any given amount of heat is spread1 so to speak1 over a larger surface1 and the larger the space over which it is spread1 the feebler it becomes4 ,what is another cause of inequality of temperature8 ,no one answered4 ,samuel1 what is the cause of day and night8 ,the turning of the earth upon its axis4 ,and the rotation of the earth upon its axis1 continued ,mr4 ,wilton1 brings not only an alternation of light and darkness1 but also of heat and cold4 ,the heat of the sun is withdrawn along with the light4 ,the heat of the sun is not withdrawn from the earth1 but one-half of the earth's surface is constantly turned away from its influence4 ,this must produce a daily change of temperature4 ,this diurnal fluctuation of temperature may be very small or it may amount to seventy or eighty degrees4 ,samuel1 what is a third cause of unequal temperature8 ,the inclined position of the earth's axis and the revolution of the earth around the sun cause the change of seasons4 ,if it were not for this1 the earth would still have her zones of seasons2 a part of the earth would have endless summer1 a part endless spring1 and the rest unbroken winter1 but the alternation of seasons at the same place would be unknown4 ,the axis of the earth is now inclined about twenty-three degrees1 twenty-seven minutes1 twenty-three seconds to the plane of the earth's orbit1 and as this axis maintains constantly the same position1 being parallel in one part of the earth's orbit to its position in any other part of its orbit1 during one part of the year the north pole is turned twenty-three and a half degrees toward the sun1 while in the opposite part of the year the south pole is in like manner brought into the light and heat4 ,this causes the sun to appear to move to and fro1 north and south1 twenty-three degrees1 twenty-seven minutes1 and twenty-three seconds from the equator in either direction4 ,the tropics1 or turning-places1 mark the limits of the sun's northern and southern journey4 ,everywhere between the tropics the sun1 at some period of the year1 passes through the zenith1 that is1 exactly overhead at noon4 ,north and south of the tropics the sun seems to rise higher in summer and to sink lower in winter4 ,in summer the sun at midday is about forty-seven degrees nearer the zenith than in winter4 ,within the polar circles1 which are the same distance from the poles as the tropics from the equator1 the heat of the sun is entirely withdrawn during a portion of the year1 and during another portion of about equal length the sun does not set4 ,the extremes of temperature1 caused by the inclination of the earth's axis and its revolution around the sun1 are very great4 ,in the northern part of ,minnesota1 the temperature rises in summer to one hundred degrees1 and in winter sinks to fifty degrees below zero1 giving thus an alternation of one hundred and fifty degrees4 ,in this connection you may also remember that the sun is nearer the earth in one part of its orbit than in another part4 ,this difference amounts to about #c1jjj1jjj miles4 ,the sun also remains eight days longer north of the equator than south of it4 ,our summer1 therefore1 is eight days longer than the summer of the southern hemispheres1 and our winters are correspondingly shorter4 ,these differences tend1 however1 to balance each other1 for while the southern summer is shorter1 the sun at that time is nearer1 and while our summer is longer1 the sun is more distant4 ,peter1 you may explain to us the effect upon temperature caused by the division of the earth's surface into land and water4 ,i learned while studying physical geography that the temperature is more even upon the sea than upon the land4 ,but why1 ,i do not know4 ,the smooth surface of the sea reflects heat better than the rough land3 for this reason1 a larger proportion of the heat which falls upon the sea is not absorbed1 but reflected and lost1 so far as the temperature of this world is concerned4 ,water is also a very poor conductor of heat1 and has withal a very high specific heat4 ,for these reasons the sea receives and parts with heat more slowly than the land1 and its absorption or radiation causes a smaller variation of temperature4 ,the result is1 therefore1 that the sea is cooler in summer and warmer in winter than the land1 and the average ocean temperature is lower than the mean continental temperature4 ,the land receives heat more readily and parts with it more rapidly2 the fluctuations of temperature must therefore be greater4 ,hence1 the interiors of the continents have much greater extremes of temperature than the sea-board4 ,but of the influence of water in equalizing temperature ,i shall have occasion to speak again more at length1 and will pass it by for the present4 ,what effect1 ,peter1 has the unevenness of the earth's surface upon temperature8 ,the higher we ascend upon mountains1 the colder we find it4 ,that is1 ,peter1 the greater the elevation of any place or country above the sea level1 the lower the temperature4 ,almost the whole surface of the earth is an alternation of mountain and hill1 valley and plain4 ,one continent has a very much greater mean elevation than another4 ,one region or tract of country lies sloping toward the sun1 another is inclined from it4 ,the effect in the one case is the same as if the sun were brought more nearly overhead2 in the other case1 the sun is depressed toward the horizon4 ,it is all the same as if the region of country were brought nearer the equator or removed farther from it4 ,the effects of the curvature of the earth are obviated or exaggerated4 ,do clouds tend to produce inequalities of temperature8 ,i think they must do this1 answered ,samuel4 ,clouds cover one portion of the earth's surface and shut out the heat of the sun1 while other portions are well exposed to the sun's rays4 ,that is right1 ,samuel4 ,does any one think of another cause of inequality of temperature8 ,there was a pause4 ,then ,mr4 ,hume answered3 ,considering the unmeasured cycles of the past1 the gradual cooling of the earth has brought a great change of temperature4 ,and this change1 continued ,mr4 ,wilton1 has been very important for the welfare of the human race4 ,at the present temperature of the earth1 the coal-beds1 so necessary for the culture and progress of the race1 could hardly have been formed1 and at the temperature of the carboniferous periods1 when the coal-beds were deposited1 the human race could with difficulty have survived4 ,the high temperature required to prepare the earth for man is now no longer needed1 but would prove destructive4 ,and this great change of temperature was doubtless caused by the cooling of the earth4 ,the result of all these agencies--the shape of the earth1 its daily and yearly motions1 the inclination of its axis1 the eccentricity of its orbit1 the division of its surface into land and water1 the varying elevation of its surface1 and the clouds and storms that hide the sun--is that we have great extremes and rapid transitions of heat and cold1 and every variety of climate4 ,these changes of temperature are often painful and1 unless guarded against1 dangerous4 ,yet1 taken as a whole1 can one doubt that variety of climate and change of temperature are of advantage to man8 ,what weariness and lassitude a changeless temperature would bring6 ,how the cooler air of the night comes as a tonic after the relaxation of the heated noonday6 ,who can estimate the value of our northern winters1 not alone in building up a vigorous and nervous physical frame1 but in helping the culture of men and nurturing the domestic virtues8 ,we might almost say that her winter evenings have been the making of ,new ,england4 ,but periods of heat are needed for bringing fruit and grain to ripeness4 ,what variety and richness of productions for the use of man the different zones furnish6 ,the supply of man's wants would be comparatively meagre if we had but one zone1 even though we had our choice of the zones4 ,but every zone is necessary for the perfection of the temperate zones4 ,that we may have the warmth of summer in the temperate zones we must have the torrid zone4 ,that we may have the tonic cold of the temperate zones we must needs have the severity of polar winters4 ,i do not mean that the ,creator could not devise a world that should not have these painful extremes1 yet enjoy the advantages of the temperate regions4 ,but that would plainly require a world constituted upon principles very unlike those which now prevail4 ,with ,god this is doubtless possible1 but the mode is to us inconceivable4 ,but we can easily see that by the present arrangement of things ,god has secured many great advantages for man--how many and how great1 we can hardly understand--and the apparent disadvantages we cannot positively affirm to be real evils4 ,we can safely declare that this world is well adapted to man's necessities4 ,but these inequalities of temperature are modified and softened by a most comprehensive and beneficent system of agencies by which the extremes are prevented from becoming destructive4 ,in this system of compensating agencies two great divine ideas are clearly developed1 economy in the expenditure of heat and benevolence toward man4 ,upon this subject we are now prepared to enter4 ,,chapter ,,viii4 ,,modification ,,of ,,temperature4 ,resuming the subject where it was left the previous ,lord's ,day1 ,mr4 ,wilton said3 ,we saw at our last session that the most prominent and permanent features of the earth tend to produce differences and great extremes of temperature4 ,these variations of temperature within due limits must be regarded as beneficial1 if not absolutely essential1 to the well-being of the human race4 ,the different zones give the world a richer and more varied supply of food1 and finer and more varied plants and animals4 ,the change of seasons gives variety in the experience of life2 the warmth of summer ripens the fruit and grain1 and the cold of winter tones up the physical strength2 nay1 the winter's frost is a natural subsoiler1 loosening up the hard earth and promoting vegetable growth4 ,as for man's higher interests1 no one can tell how much the world is indebted to winter evenings1 to a period of darkness longer than is needed for sleep1 and a period of cold during which the work of husbandry may largely cease4 ,learning1 the domestic virtues1 and religion are greatly indebted to our winters4 ,but were these agencies which tend to produce inequality of temperature suffered to operate without counteracting influences1 the extremes of heat and cold would cease to be genial and healthful1 and become destructive4 ,we are now to begin the consideration of those counteracting agencies by which the extremes of temperature are moderated4 ,let us look first at the daily fluctuation of temperature caused by the revolution of the earth upon its axis4 ,the rotation of the earth brings every place by turns under the influence of the sun's rays1 and in turn withdraws it from the heat of the sun1 thus producing a daily change of temperature4 ,how is this diurnal change of temperature alleviated8 ,this was addressed to all1 but no one answered4 ,mr4 ,hume1 ,i should be glad to have you suggest the answer4 ,there are two chief agencies1 ,mr4 ,hume replied--first1 the absorption of heat during the day and the radiation of that heat during the night2 and1 secondly1 the formation of watery vapor during the day and the deposition of dew by night4 ,the first of these agencies1 said ,mr4 ,wilton1 is so plain that very little explanation need be made4 ,during the day1 while the sun is shining and the temperature is rising1 the surface of the earth1 the rocks1 the trees1 and all things are absorbing heat4 ,this heat is1 so to speak1 laid up in store1 ready for use in time of need4 ,in due time the sun sinks low and sets behind the horizon2 the supply of heat is cut off and the temperature begins to fall4 ,then all those objects which during the day were laying up heat in store begin to radiate heat into the air1 and by their contact with it keep up its warmth4 ,commonly1 the temperature falls so low that bodies radiate more heat than they absorb before the setting of the sun4 ,in this process water plays a very conspicuous part4 ,you will call to mind what was said before about the large specific heat of water4 ,by means of this1 water is able to store up heat in large amounts--larger in proportion to its weight than any other substance except hydrogen gas4 ,the heat that is stored up during the day is given off by contact with the air and by radiation during the night4 ,but water plays a still more important part in moderating the daily fluctuations of temperature by the process of evaporation and the formation of dew4 ,call to mind what was said of the formation of vapor when we were speaking of latent heat4 ,heat water to two hundred and twelve degrees--the boiling point3 it must still be heated a long time before it evaporates4 ,boiling water must receive five and a half times more heat to give it the form of vapor than to raise it from the freezing to the boiling point2 that is1 about one thousand degrees of heat are required to turn boiling hot water to vapor4 ,the same amount of heat is required for the formation of vapor whatever the temperature of the water from which the vapor rises4 ,there is only this difference--vapor from cold water is cold1 while vapor from hot water is hot4 ,evaporation goes on more rapidly in proportion as the temperature rises1 but vapor is formed at all temperatures4 ,evaporation goes on from ice4 ,the ,alpine glaciers1 or rivers of ice1 sink away several feet by evaporation from their surface during their slow course of many years down the mountain ravines4 ,this process of evaporation goes on1 ,i say1 during the day1 and in the formation of vapor an amount of heat which would raise an equal weight of water through one thousand degrees of temperature is used up4 ,this vapor which is formed is not supported by the air1 as men commonly suppose4 ,it is true that clouds are held up by the atmosphere1 but clouds are condensed vapor--minute globules of water floating in the air4 ,vapor is invisible4 ,you must have noticed that steam is invisible till it is condensed by contact with the colder air4 ,vapor rests upon the earth and supports itself by its own elastic force1 just as the atmosphere supports itself4 ,the presence of air makes no difference with the formation of vapor1 except that in a vacuum vapor forms very much more rapidly1 because no air stands in its way4 ,but at any given temperature1 in the air or in a vacuum1 the same amount of vapor rises in due time1 and the same amount can support itself4 ,vapor seems to circulate between the atoms of air1 as sand fills the spaces between marbles4 ,at the temperature of four degrees below zero vapor equal to two-thirds of an inch of water can be formed and support itself by its elasticity2 that is1 the elastic force of vapor at four degrees below zero is equal to two-fifths of an ounce per square inch2 at thirty-six degrees vapor equal to two and two-thirds inches of water can support itself2 at eighty degrees vapor equal to thirteen inches of water can exist2 at one hundred and seventy-nine degrees1 seventeen feet2 and at two hundred and twelve degrees nearly thirty-four feet2 that is1 vapor at two hundred and twelve degrees has an elastic force of fifteen pounds to the square inch4 ,let us suppose that at sunrise the air has a temperature of thirty-six degrees1 and that as much vapor is already formed as can sustain itself at that temperature4 ,as the sun sheds down his rays the temperature rises and more vapor is formed4 ,we will suppose that half an inch of water is evaporated4 ,some of this vapor will be carried by ascending currents of air into the higher regions and condensed into clouds1 some will be carried by winds into drier and warmer regions1 yet the amount of vapor will increase during the day4 ,we will suppose that during the night the temperature falls again to thirty-six degrees2 all the excess of vapor above two inches and two-thirds of water will be condensed and become dew or fog1 and in this condensation the thousand degrees of heat absorbed in the formation of the vapor will be given out again4 ,if vapor equal to one inch of water be condensed1 heat is set free sufficient to boil a sheet of ice water1 five and a half inches in thickness1 extending over the whole region2 that is1 it would be all the same as if a fire were kindled on every square rod of land hot enough to boil during the night more than twenty barrels of ice water4 ,in this illustration ,i have supposed a larger condensation than commonly takes place1 but very much less than is conceivable4 ,suppose that the temperature is eighty degrees1 and that1 as is possible1 more than one foot of water exists in the state of vapor4 ,let the temperature fall to thirty-six degrees1 and full ten inches of water must be condensed1 setting free heat which would boil four and a half feet of ice water4 ,so large a condensation as this never takes place in twelve hours1 partly because the full amount of vapor which might be formed is never actually produced1 and partly because the condensation of but a small part of this vapor would check the fall of temperature and prevent farther condensation4 ,the supposition that ,i have made shows the possibilities of this method of moderating extremes of heat and cold4 ,were it not for these processes1 our days would be much warmer and our nights much cooler than they now are4 ,by the formation of vapor the excess of heat during the day is stored up in a latent form2 that is1 it is used1 not as heat1 but as force1 and is employed in bringing the atoms of water into new relationship2 during the night the vapor returns to its former state as water1 and the heat-force again becomes sensible heat4 ,thus the day is cooled and the night made warmer4 ,ansel1 have you ever heard the 'dew point' spoken of8 ,yes1 sir1 ,i have4 ,do you know what is meant by it8 ,that point or degree of temperature at which dew begins to be formed4 ,upon what does the dew point depend8 ,upon the amount of vapor in the air4 ,that is right1 ,ansel4 ,if at any time the full possible amount of vapor should exist1 any diminution of the temperature must1 of course1 cause dew to be deposited4 ,do you know1 ,ansel1 how to ascertain the dew point at any time8 ,no1 sir1 ,i do not4 ,there is a beautiful instrument known as ,daniell's ,hygrometer which shows the dew point as a thermometer shows the temperature4 ,but any one can easily determine the dew point without a special instrument for that purpose4 ,pour warm water into a glass pitcher or goblet whose outer surface has been wiped perfectly dry1 and polished4 ,into this set a common thermometer4 ,cool down this warm water by dropping into it small pieces of ice1 and notice carefully when the polished glass begins to be dimmed as if it had been breathed upon4 ,when that begins to take place the thermometer will show the dew point4 ,in this manner we can determine the amount of vapor in the air1 and by estimating the probable temperature of the night judge of the probability that dew will fall4 ,i have noticed some things1 said ,peter1 about the formation of dew which ,i do not understand1 and ,i wish very much to ask about them4 ,i should be glad to hear your questions1 and will answer them if ,i can4 ,i have noticed that dew falls on clear nights1 but not very often on cloudy nights4 ,i don't see why that is so4 ,have you ever noticed whether cloudy nights or clear nights are the warmer8 ,cloudy nights are commonly warmer1 ,i think1 but ,i never could see the reason for that1 either4 ,can you tell why a newspaper spread over a tomato vine keeps the frost from the vine8 ,because the frost comes upon the paper instead of the vine1 of course4 ,but why do you say1 of course8 ,why does not the dew--for frost is nothing but dew frozen as it forms--come upon the under side of the paper8 ,how could the dew fall upon the under side8 ,that is just the point which we need first of all to understand4 ,men commonly speak of dew as if it fell4 ,i don't know but ,i have spoken of the falling of dew in this lesson4 ,but dew does not fall at all4 ,the vapor simply touches some cold object1 and is condensed upon it4 ,the vapor by its elasticity presses against the cold body1 and the process of condensation continues until either the body is warmed by the heat set free so that its temperature rises above the dew point1 or till the vapor is so far exhausted that the dew point falls below the existing temperature4 ,dew is formed upon the upper surface and not upon the under1 because the upper surface is cool and the under surface is warmer4 ,beneath the paper spread over the tomato vine1 the earth is radiating heat and the paper is radiating it back again4 ,if the paper were not there1 the heat would be radiated into space and not returned again4 ,the vine would soon radiate away its little store of heat1 its temperature would sink1 below the dew point1 and dew or frost would be deposited upon it4 ,the under surfaces of objects are kept warm by the radiation from the earth4 ,in the same manner clouds are wrapped around the earth and keep it warm by radiating back its radiant heat4 ,dew is not formed on cloudy nights1 because they are warmer3 the clouds throw back the heat which otherwise would be lost in open space4 ,i never knew before1 said ,peter1 that clouds were of any great use except to send down rain4 ,we shall see in the course of our lessons that clouds are of very great use in warming the earth in other ways1 as well as by serving as blankets and radiating back the heat which otherwise would escape4 ,i wanted also to ask why dew falls--,i mean1 is formed--on grass and leaves of plants while stones are dry4 ,i will answer your question by asking another4 ,did you ever see barefoot boys running in the cold dew stop and stand upon a stone or rock to get their feet warm8 ,oh yes1 sir2 ,i have done it myself4 ,why did you stand upon a rock8 ,because ,i had learned that the rocks would be warm4 ,i think that answers your question4 ,the rocks and stones are warmer than the grass and the leaves4 ,the blades of grass and the leaves are thin and pointed and rough1 and have a very large radiating surface4 ,they have but little heat1 and that little they part with rapidly4 ,the rocks and stones1 on the other hand1 are bulky1 and contain a much larger store of heat1 their radiating surface is comparatively small2 only one side is exposed1 the other being covered by the warm earth1 from which they are drinking in heat almost as rapidly as they lose it4 ,they therefore do not lose heat enough to sink their temperature to the dew point4 ,so much1 then1 for the means employed to moderate the changes of temperature from day to night and from night to day4 ,but upon the sea-coast and upon certain islands of the sea another agency is employed4 ,will some one suggest what this agency is8 ,no one else answered1 and finally ,mr4 ,hume said3 ,i suppose1 of course1 that you refer to the land and sea breezes8 ,this is what ,i had in mind4 ,during the day the land is warmer than the sea1 and the breeze from the sea blowing upon the land cools the air4 ,during the night the land radiates its heat more rapidly than the water1 and soon the sea becomes the warmer4 ,then a breeze springs up in the opposite direction2 the cooler air of the land flows out upon the sea4 ,by this means the air upon the land and the air upon the sea are daily commingled1 thus securing a more even temperature upon the land4 ,this softens the extremes of daily temperature4 ,i make only this brief reference to the land and sea breezes1 because in another connection we shall examine the general subject of winds and their influence in the equalization of temperature4 ,the result of all these influences is that the changes of temperature from day to night and from night to day1 while not inconsiderable1 are by no means destructive1 and in many cases are no greater than is refreshing and agreeable4 ,these agencies remind us every day of the wise provision of the ,creator for the well-being of his creatures4 ',day unto day uttereth speech and night unto night showeth knowledge4 ,there is no speech nor language where their voice is not heard4' ,this care for the earthly well-being of men is but a type of his care for their spiritual happiness4 ,the plan of salvation1 and the ways of divine providence working in accordance therewith1 are more wonderful both in their means and their end than the greatest of the works of ,nature4 ,if while we study the natural we forget the supernatural1 we commit the greatest mistake3 we pass by the greater to examine the less4 ,the natural is valuable only as it leads to the spiritual4 ,,chapter ,,ix4 ,,the ,,ministry ,,of ,,suffering4 ,you must know1 ,mr4 ,wilton1 said ,mr4 ,hume1 that my mind is full of objections1 whether ,i speak them out or keep silence4 ,i have looked so long upon one side only that ,i find it hard to look upon other sides also2 and if there be a ,satan1 as the ,bible teaches1 ,i think he must be marshaling all his legions to overwhelm me by the force of his impetuous assaults4 ,i cannot disguise the fact--,i do not attempt to disguise it--that my mind is not at ease4 ,it used to be at rest1 at least comparatively so--not happy1 yet not agitated and distressed4 ,my heart was not satisfied1 but ,i believed that my position of unbelief was logically impregnable4 ,but ,i confess it1 my unbelief has of late been shaken4 ,i am no longer contented4 ,how ,i came into this state1 ,i do not know4 ,i am certain that my present unrest was not produced by the force of arguments which ,i had heard4 ,it seems to me as if it sprang up uncaused4 ,the old arguments which ,i have thought impregnable do not now satisfy me4 ,why1 ,i cannot tell4 ,i think this statement is due to you to explain my position in your ,bible class1 and also to prepare the way for a question which ,i wish very much to propose4 ,i have no objections to make to the marks of wisdom and benevolent design seen in the works of creation which ,i cannot myself answer and remove4 ,good-will and goodness to the inhabitants of the earth lie on the very surface of things2 or1 if ,i go beneath the surface1 ,i find them no less manifest in the profoundest and subtlest arrangements of the universe4 ,if ,i say1 ',this is all the work of chance1' my very language is self-contradictory and looks me out of countenance1 for the very idea of chance is the opposite of wise and orderly arrangement4 ,the difference between design and chance is that the one works by orderly arrangements adapted to the accomplishment of a foreseen end1 while the other shows itself in chaotic disorder1 with no adaptation to the accomplishment of a purpose4 ,to say that a universe like this1 filled in every part with order and beauty1 with subtle and unseen elements and agencies working out into the boldest relief in the accomplishment of beneficent ends1 all minute elements blending in the sublime sweep of the universal plan1--to say that such a universe is the work of chance is to use language without meaning4 ,if ,i deny a providential plan in the creation and government of the world1 and attribute to brute matter a nature that1 by its own inherent force1 spontaneously develops into all these contrivances of use and beauty1 ,i see that the wisdom of the whole universe is concentrated in the nature of matter1 and1 if it be possible1 infinite subtlety of design is doubly manifest4 ,to create a machine which1 upon its elements being thrown into an indiscriminate pile1 shall arrange itself1 adapt part to part1 and set itself in motion2 which shall repair all its breaks1 produce other machines as curious as itself1 and thus reproduce itself and perpetuate its existence for ever--that would certainly be the acme of intelligent design4 ,or if ,i go farther and deny a ,creator1 ascribing to the universe an eternal1 uncreated existence1 ,i see that ,i only entangle myself in a complication of difficulties4 ,i find myself standing face to face with the best-established facts of geology4 ,if the fact that the animal tribes which inhabit the earth1 and especially the human race1 had a beginning be not well established1 then no fact in geological science can be reckoned as fixed4 ,geology has overturned the idea of an infinite series of generations of animals and men4 ,nor do ,i see that ,i gain any advantage or give any explanation of the universe by attributing to matter everything which others refer to an intelligent and almighty ,creator4 ,the distinction between mind and matter is that mind is endowed with intelligence and will1 while matter has neither intelligence nor will1 but only blind forces1 blind attractions and repulsions4 ,if ,i attribute the order1 beauty1 design1 and benevolence of the universe to mere matter1 ,i clothe matter with the attributes of spirit4 ,in fact1 ,i only set up another ,god and ascribe to the universe a true divinity4 ,i make myself a kind of pantheist1 investing all matter with the attributes of mind and spirit4 ,all this ,i have pondered over for many a day1 and ,i cannot deny that a belief in an intelligent ,creator of the universe is logically more satisfactory4 ,but there is one question which confronts me at every turn4 ,i suppose that ,i might at length work out an answer for myself and that ,i should now see the explanation if all my thinking for so many years had not been upon the other side4 ,i am afraid that ,i shall not be able to give you satisfaction1 replied ,mr4 ,wilton1 but ,i shall be glad to hear your question4 ,i can at least appreciate your state1 and sympathize with you in your groping and struggling4 ,i am glad that you are walking the road you have just described4 ,you say that you do not know what has brought you to your present state4 ,i can easily tell you3 your experience at this point is not singular2 ,i think the ,holy ,spirit of ,god has been leading you and has brought you to your present position4 ,i trust in ,god that he will lead you still farther4 ,you have great cause for thankfulness and great cause for trembling4 ,let me caution you3 be careful how you treat the divine ,spirit2 walk softly2 be honest1 sincere1 and simple-hearted as a little child4 ',except a man become as a little child1 he cannot see the kingdom of ,god4' ,above all things1 be sincere and straightforward4 ,deal truly and frankly with the ,spirit4 ,if you will only be honest and frank1--honest and frank to yourself1 honest and frank to all men1 honest and frank with ,god1--,god will soon give you cause to praise him and love him for ever and ever4 ,but what is the question which you wished to propose8 ,my difficulty is this3 ,along with the many arrangements for conferring enjoyment and promoting the well-being of man are other arrangements for suffering4 ,man is made as capable of suffering as of enjoyment1 and there are appliances provided which are certain to inflict that pain of which man is capable4 ,how is this provision for suffering in man and in all sentient creatures consistent with the benevolence elsewhere shown8 ,how are we to combine these two sets of arrangements in our thinking8 ,a full unfolding of the ministry of pain in the good providence of ,god would lead us entirely aside from our course of study4 ,but for me1 said ,mr4 ,hume1 earnestly1 it would be not at all aside2 for if ,i can once see that the provision for suffering made in the constitution of man and of ,nature is not repugnant to the idea of a wise and good ,creator and ,disposer of human affairs1 ,i will admit whatever you shall have to say afterward1 and ,i shall feel that the gospel of ,christ comes to man and comes to me with a moral force which ought not to be resisted4 ,i know that ,i have no right to come into your class and ask you to turn aside from your course of study1 and the gospel certainly owes nothing to me1 yet ,i do hope you will give the opinions which you hold upon this subject1 if you have formed any positive opinions4 ,i am sure1 exclaimed ,peter1 that we shall all be very glad to have you spend the time of this lesson in speaking of this subject4 ,but how would it please you if my talk upon the ministry of pain should prove to be very much like a sermon8 ,i think we like your sermons4 ,i know that we were never so much interested in them as now4 ,very well1 then2 ,i will give you1 as ,mr4 ,hume says1 some of my conclusions touching this matter of pain and suffering2 and if my opinions are not satisfactory or do not cover the facts in the case1 it will not be because ,i have given the subject little thought or have had little experience of suffering4 ,the ,lord has led me by a rugged road2 he has given me tears to drink and mingled my cup with weeping4 ,but for this ,i thank him1 and ,i expect1 when ,i shall look back from the life to come upon my earthly course1 to see my days of pain and grief shining more brightly than the hours of radiant sunshine4 ,first of all1 then1 ,i believe that with the clear exhibition of benevolent design which we see in this world we ought not to doubt the goodness of the ,creator1 even if we can give no rational explanation of the suffering which abounds4 ,we ought not to believe1 we cannot believe1 that the ,creator's own attributes are self-contradictory and antagonistic1 that the same infinite ,being is both good and evil1 partly benevolent and partly malignant4 ,if ,god is good at all1 he is wholly good4 ,nor can we believe that a good being and an evil being--,god and ,satan--hold joint sway over the universe and co-operated in the work of creation1 and that the good is to be ascribed to the one1 and the pain and suffering to the other4 ,whether we can explain it or not1 we must believe that there is a good reason for the existence of suffering2 unless1 indeed1 we count the infliction of pain the chief end of the creation1 and refer the happiness which men enjoy to some incidental arrangements not contemplated as important in the work of creation4 ,but no sane man can think that this world is the work of a demon seeking to fill the earth with groans and wretchedness4 ,our consciences and our reason alike require us to believe in the supremacy of goodness4 ,in presenting my views1 ,i of course cannot attempt to prove everything from the beginning3 ,i must take some things for granted between us4 ,we must start with the admission that there is a ,god1 and that he is a righteous1 moral governor4 ,we must at least believe what ,paul declares to be needful3 ',he that cometh to ,god must believe that he is1 and that he is a rewarder of them that diligently seek him4' ,we must also believe our own consciences when they testify that men are responsible1 free moral actors1 and that sin and guilt are not false notions arising from diseased and morbid mental conditions1 but realities1 true ideas which arise in the mind when it works as ,god designed4 ,do you freely admit these points of belief1 ,mr4 ,hume8 ,yes1 sir2 ,i could not ask you to prove every point touched upon in the argument1 for that would require half a score of volumes1 nor will ,i deny the testimony of my own conscience that there is a ,god1 and that men are rightly responsible to him4 ,starting1 then1 with these fundamental principles1 we will look first at the provision made for physical pain4 ,men and1 ,i suppose1 all living creatures are created with the capacity of suffering4 ,the same nerves of sensation which if excited naturally give rise to pleasure may be excited unnaturally and inflict pain4 ,but why not endow living creatures with nerves of sensation which could experience pleasure1 but could not feel pain8 ,is this possible8 ,perhaps so1 but no man can affirm it with certainty4 ,i do not think that any man can clearly conceive such a thing4 ,to us the capacity of enjoying and that of suffering seem inseparable4 ,but there is no need of insisting upon this point1 for the capacity of feeling pain is a most benevolent provision of the ,creator for the benefit of living creatures4 ,it is designed to save life and limb4 ,pain is the sentinel set to guard the outposts of the citadel of life4 ,if there were no pain1 men would thrust their hands into flames without knowing it4 ,they would indulge in all manner of destructive excesses1 and no sufferings would warn them of danger4 ,they would drink poison1 and no pain would bid them make haste to take the antidote4 ,tear men limb from limb1 hew them in pieces with the sword1 and no painful sensations would rouse them to self-defence4 ,without this benevolent provision of pain the race of man could hardly be saved from extinction4 ,how much more would this be true of the animal tribes1 which are wholly dependent on instinct for guidance and impulse to action6 ,we accordingly find pain possible in those parts of the body where pain can subserve the purpose of protection2 elsewhere no provision is made for pain4 ,nerves of sensation abound in those parts which require especial care or are especially exposed4 ,the skin is exposed1 therefore the skin is well supplied with nerves4 ,the parts beneath the skin are less exposed1 and are injured only by first wounding the skin2 they are therefore less sensitive4 ,the heart1 though so very important1 is almost insensible to pain1 because the capacity of suffering at that point would confer no protection4 ,the eye is delicate and requires the greatest care1 and to secure that needed care the ,creator has made it delicately susceptible of pain4 ,the sole of the foot1 as its work demanded1 was made capable of bearing the roughest usage1 and hence the sole of the foot is but little supplied with nerves of sensation4 ,still farther1 when on account of injury any part of the body requires unwonted care1 provision is made that the injured part shall become especially sensitive4 ,a bone when well and sound may be cut or sawed almost without pain1 but when the bone is injured it becomes inflamed and feels pain most keenly4 ,when a limb for the sake of its own safety ought to be kept quiet1 ,nature makes it painful to move it4 ,for the benevolent object of preserving life and guarding the well-being of living creatures pain is given4 ,the provision for pain shows the presence of danger1 the liability of receiving injury1 and the kind design of putting men on their guard4 ,it is the automatic guardian of our happiness4 ,this is all that ,i have to say about bodily pain4 ,mental suffering and pain of conscience are designed1 first of all1 to subserve the same purpose4 ,the sense of guilt when a man commits a wicked act is designed1 first1 to lead him to repentance4 ,it is the divine alarum placed within the soul to remind men that they have done evil and received moral damage which must be repaired4 ,it is the moral goad which pricks men to warn them to turn from wickedness4 ,if evil-doing were as pleasant as well-doing1 men would see no difference between right and wrong2 all moral ideas would be subverted and the glory and beauty of man would be trailed in the dust4 ,but a guilty conscience continues to trouble wicked men after the day of repentance has passed2 ,remorse indeed seems to rise up with preternatural power when ,mercy has withdrawn for ever from the sight of ,hope4 ,what is the meaning of this8 ,it means that which we admitted in the beginning1 that sinners are guilty in ,god's sight1 that guilt is a real thing and deserves punishment1 and that ,god1 the holy and righteous ,king of men1 does actually punish the guilty4 ,god is holy and abhors sin4 ,remorse of conscience is the shadow of the ,creator's frown1 the voice of his eternal indignation echoing and re-echoing in the soul of man4 ,it is the divine wrath penetrating the human spirit and making itself felt4 ,as the holy ,god abhors sin for ever1 the wicked must expect to feel that abhorrence for ever4 ,he who puts himself into a rebellious position toward his ,creator must stand in that unnatural attitude guilty and suffering4 ,we can conceive that this should be otherwise only by subverting the foundations of the moral world4 ,beings created in the image of ,god1 created with a conscience and moral affections1 created with moral freedom1 can attain blessedness only by aspiring to heavenly things and becoming ,god-like4 ,if they break away from the divine will and order1 they must suffer the divine frown1 they must feel that frown4 ,how can ,god make his frown felt except by looking pain1 so to speak1 into the sinner's conscience8 ,but this whole subject of pain and suffering derives a double significance from the fact that the human race is a fallen race1 alienated from ,god by wicked works1 yet under a merciful dispensation in which they are called to return to obedience4 ,there is no moral quality good and beautiful to our eyes or pleasing to ,god in which men are not altogether lacking1 and what is still worse1 men grow in evil2 their last state is worse than the first4 ,there is no healing power in the man which can renovate his heart and bring him back to holiness4 ,it would seem as if some satanic power were hurrying the human race along the road to ruin4 ,if men are to be saved1 it must be by a force of renovation outside of themselves1 which shall reverse the evil bias of their nature4 ,you say that the world seems fitted to develop man's capacity for suffering1 and that this appears to be as much a part of the divine plan as the impartation of happiness4 ,what1 think you1 would be the result if the human race were planted in a world where nothing could give pain1 where everything would afford gratification8 ,what1 ,mr4 ,hume1 do you think the effect would be upon creatures such as we all know men to be8 ,i hardly dare answer with the little thought ,i have given to the subject4 ,i would rather listen than speak4 ,i have noticed1 exclaimed ,ansel1 that those boys who have everything done to suit them at home are the most unmanageable in school and the most disagreeable to play with4 ,picture to yourselves1 continued ,mr4 ,wilton1 a man who from childhood should have nothing to suffer1 no pain or weariness or hardness to bear4 ,from childhood he has no bodily pain1 and the comforts of life are so carefully and bountifully provided that he receives no unpleasant sensation4 ,winter never chills him1 summer never heats him4 ,his slightest wants are all anticipated4 ,all his sensations are pleasure4 ,let the same be true of his mind4 ,his will is never crossed2 whatever he wishes is given him2 there is no call for self-denial or self-control or abstinence or patience4 ,he feels no pressure of need spurring him to exertion4 ,his whole life is enjoyment4 ,his very body would grow up1 not strengthened and compacted for exertion1 but fitted only for the softness of indolence and ease4 ,his will would be the selfishness of self-will rather than an intelligent1 reasonable self-control4 ,there would be no tenderness and power of love1 no endurance and patience in labor1 no strength of moral purpose under temptation1 no self-denial and self-sacrifice of love for the good of others or for the attainment of a higher blessedness1 no faith in ,god nurtured in darkness and trial4 ,we should have a mushroom growth of luxurious tastes and indolent ease1 impulsiveness and impatience1 strength only in selfish1 passionate self-will and rampant1 luxuriant vices4 ,no other result would be possible with creatures like us4 ,strength is developed only under circumstances which call for the exercise of strength4 ,a certain hardness and hardihood of living is needed to develop a manly body4 ,resolute intellectual exertion in the face of difficulties is demanded to educate the mental faculties4 ,an earthly life not wholly satisfactory is needed to awaken in faithless men a longing for a better land4 ,we may look upon the sufferings of this world1 taken as a whole1 as an expression of ,god's displeasure at sin4 ,how very much is such an expression needed6 ,if life were nothing but pleasure1 how completely men would forget sin and duty and ,god and heaven6 ,all the varied experiences of joy and sorrow1 of good and ill1 of trial and triumph1 are needed for man's spiritual discipline4 ,i think you will bear me witness that the noblest1 sweetest1 most beautiful characters are found in those who have drunk the cup of sorrow to the dregs4 ,i cannot deny it1 ,mr4 ,wilton4 ,there is old ,deacon ,smith4 ,we all know something of his history1 ,i suppose4 ,he was a poor boy2 when he was twelve years of age his father died1 and his mother died four years later4 ,but he worked his way1 first to a good education1 and then to an honorable position and ample fortune4 ,then the dishonesty of a partner brought him back to poverty too late in life for him to recover himself4 ,now in his old age he works for a small salary in the office of another4 ,but he is as cheerful and as grateful as if he had all that heart could wish1 and had never in his life suffered a pang4 ,i think he verily believes that everything which has befallen him has been an expression of ,god's love for him4 ,he sheds no tears except for the griefs of others4 ,i think he truly rejoices with those that rejoice and weeps with those that weep4 ,as for faith in ,god1 ,i suppose he would go into a lion's den as calmly as did ,daniel4 ,if every professor of religion were like him1 ,i am sure that nobody could say a word against the gospel4 ,i freely confess that ,deacon ,smith's character has affected me more than all the arguments ,i have heard in favor of ,christianity4 ,as to that1 ,mr4 ,hume1 replied ,mr4 ,wilton1 we have both of us1 doubtless1 seen men who would hate a man the more bitterly in proportion as he should show himself ,christlike4 ,and as to every church-member being like ,deacon ,smith1 we could hardly expect such a character to be nurtured in a day or a year4 ,deacon ,smith has become what he is by a lifetime of severest spiritual discipline and patient endeavor4 ,such characters are wrought out only by a discipline of every form of trial4 ,this world is constituted as it is for the purpose of giving just such a discipline of effort and patience4 ,this explanation brings us1 however1 only to the vestibule of the great mystery of suffering in the work of recovering man from the ,fall4 ,the ,captain of our salvation1 who put himself in man's place and took upon himself all human conditions1 was made perfect through suffering4 ,the full preparation for his work as the ,saviour of man called for a discipline of pain4 ,i shall not attempt to explain this experience of ,christ1 but salvation brings the believer into a state of profoundest and most mysterious union with ,christ4 ,the believer must walk in the footsteps of ,jesus4 ,as ,christ first came into a condition of sympathy with man1 so must man come into a condition of sympathy with him4 ,the believer must share and repeat1 in a feebler way1 of course1 the experiences of the ,lord ,jesus4 ,he must fill up that which is behind of the sufferings of his ,saviour4 ,by this union with ,christ in the discipline of pain the ,christian is prepared for a union of blessedness4 ',if we suffer1 we shall also reign with him4' ,how broad and deep this union of the believer with ,christ may be1 ,i cannot tell4 ,i am not able to measure this idea4 ,it seems to me like one of ,god's infinite thoughts1 revealed in its dimness to overawe the souls of men by its shadowy sublimity--seen only enough to suggest how much vaster is that which remains unseen--an iceberg1 one part standing out and nine parts sunk in the unfathomed sea4 ,it is a thought to be felt and experienced rather than weighed and measured by human logic4 ,this is all that ,i have to say upon this subject4 ,do these views commend themselves to you1 ,mr4 ,hume8 ,i do not know1 was the reply2 ,i want to revolve the subject in my own mind4 ,i have received some new ideas1 but ,i judge that a man needs experience in this matter as well as thinking4 ,if ,i had ,deacon ,smith's experience of life1 ,i could form a better opinion4 ,as much as this ,i can see to be true--that provision for bodily pain is a safeguard to the happiness and life of men1 and that a world which should anticipate every human want1 leaving nothing to be struggled after and nothing to be endured1 would have a disastrous influence upon human character4 ,i will admit that the provision for pain is wise and good4 ,one other point1 continued ,mr4 ,wilton1 we ought to notice before leaving this subject4 ,the word of ,god says1 ',we know that all things work together for good to them which love ,god1' but it says no such thing of those who do not love him4 ,the afflictions of this life work out for the righteous 'a far more exceeding and eternal weight of glory4' ,the ministry of pain is a ministry of love only to those who submit to ,christ4 ,to those who kick at ,god's mercies the best blessings turn to evils and curses2 to the faithful in ,christ the greatest griefs and calamities become choice blessings4 ,a submissive heart and the agency of the ,holy ,spirit are needed to sanctify pain4 ,it is a great mistake to think that all men are made better by afflictions4 ,only the few get good from the discipline of life4 ,with many persons troubles only stir up the worst passions till they rage like caged tigers4 ,this last remark1 ,mr4 ,wilton1 has thrown a flood of light upon this subject4 ,but it seems strange to me to find myself saying this4 ,i see how it is that so large a part of the pains of life is found in the end to accomplish no good4 ,the evil remains evil4 ,do you think that my long trial of doubt and unrest and pain of heart can ever be blessed to my good8 ,that it can be so blessed to your good and to the good of many others ,i have no doubt2 but whether it will be1 ,i cannot tell4 ,that depends upon yourself1 upon your coming through ,christ to ,god as your heavenly ,father4 ,it is my earnest prayer that from your unrest of spirit deep peace in ,christ may break forth2 and many others unite in the same4 ,i certainly hope1 said ,mr4 ,hume1 that my life may not come to nothing4 ,it seems as if something better than a few years of mingled pain and pleasure1 overshadowed by most painful doubt and darkness and followed by a plunge into nothingness1 must be possible for me4 ,god give you grace1 said ,mr4 ,wilton1 earnestly1 to forget the things which are behind1 and reach out your hands toward the worthiest destiny6 ,but remember that there is a destiny more terrible than to cease to be1 there is a death deeper and darker than the grave4 ',there is a death whose pang ,outlasts the fleeting breath2 ,oh1 what eternal terrors hang ,around the second death6' ,mr4 ,wilton did not think it best to attempt to draw out ,mr4 ,hume farther at that time4 ,he saw that he appeared to be under the guidance of the ,holy ,spirit1 and hoped that he would soon experience the new birth by which old things pass away and all things become new4 ,he knew that time is an element even in the operations of the ,spirit1 and he feared to shake the bough too roughly lest the fruit should fall untimely only to wither in his hand4 ,happily1 the superintendent's bell brought the conversation at that point to a natural conclusion4 ,,chapter ,x4 ,,transportation ,,of ,,heat4 ,to-day we come to that subject which we should have looked at a week ago1 if that ,i hope not unprofitable discussion of the uses of trials and the ministry of pain had not prevented4 ,we must now examine the arrangement for softening the rigors of winter and toning down the heat of summer4 ,the general principle is that in summer the earth receives an excess of heat1 while in winter the opposite is true4 ,these extremes are mitigated by transferring heat from summer to winter4 ,how is this accomplished8 ,any one who has thoughts upon this subject may answer4 ,i have some thoughts1 said ,ansel1 but whether right or wrong1 ,i cannot tell4 ,i should think heat might be carried from summer to winter in the same way as from day to night4 ,what are some of those means for transferring heat which seem to you to operate the same in the annual as in the daily changes of temperature8 ,one is the absorption and radiation of heat1 and another is the evaporation of water and the condensation of vapor4 ,you are right1 said ,mr4 ,wilton4 ,the effect of these operations in the equalization of the annual extremes of heat is in no wise different from their effect upon the temperature of day and night1 but from summer to winter their effect is vaster and more impressive4 ,during the summer1 sea and land1 and 'all that in them is1' are receiving heat and rising in temperature4 ,the heat of summer penetrates and warms the earth nearly a hundred feet in depth4 ,into the sea heat penetrates still deeper4 ,how vast the amount of heat required to warm the whole surface of the earth and sea to such depths6 ,by withdrawing so much heat from active use the intensity of the summer temperature is softened4 ,during the colder months the land and sea slowly radiate their heat4 ,we can hardly over-estimate the effect of this alternate absorption and radiation of heat4 ,so great is the effect of this stored up heat that the sea and the great lakes never freeze even in the coldest winter weather1 except in the polar regions1 and the temperature must fall far below freezing and continue for a long time below the freezing point before the earth begins to freeze4 ,the great bodies of water1 remaining always at a temperature above thirty-two degrees1 are especially important in warming the wintry air4 ,in the coldest weather they seem like steaming caldrons throwing up their warm vapor4 ,it is the absorption and radiation of heat alone which prevent the temperature of the atmosphere from rising or falling suddenly to the highest or lowest point possible4 ,the sun breaks forth in all its splendor at noonday in summer3 what if the sun were to remain stationary1 shining thus in his strength for days and months8 ,everything would be consumed with heat4 ,but why do not the glowing rays of the sun raise the temperature at once to the highest possible point8 ,because the earth and sea and every object upon the earth absorb the heat1 storing it up and holding it in reserve4 ,on the other hand1 when the sun sets and his heat is withdrawn1 why does not the temperature fall suddenly to the lowest possible point8 ,because the heat held in store is slowly radiated and the change of temperature rendered gradual4 ,in this work of absorbing and radiating heat every object1 earth1 air1 and sea1 does its appropriate share4 ,but water stands chief1 and performs the largest service4 ,its high specific heat enables it to hold in store the largest calorific treasure1 and causes it to change its temperature more slowly4 ,the formation and condensation of vapor also operate in the same manner as in the transitions of day and night4 ,during the summer the higher average temperature makes it possible for a much larger amount of vapor to be formed than in winter4 ,you remember that at eighty degrees vapor equal to thirteen inches of water can sustain itself1 while at thirty-six degrees the elastic force of vapor is equal to the pressure of only two inches and two-fifths of water1 and at four degrees to three-fifths of an inch4 ,if the mean summer temperature at any place were eighty degrees1 it would be possible for more than one foot of water to be held in the form of vapor4 ,in the formation of this vapor heat would be consumed sufficient to boil more than five and a half feet of ice water4 ,if the mean winter temperature at the same place be thirty-six degrees1 more than three-fourths of this vapor must be condensed and give out its latent heat to warm the air4 ,it is not to be supposed that the full amount of vapor which can support itself does commonly exist1 but the difference between the average amount of vapor in summer and in winter must be very great4 ,i suppose this difference often amounts to four or six inches of water4 ,if we suppose it to be four inches1 an amount of heat is transferred from summer to winter sufficient to boil twenty-two inches of ice water4 ,in estimating the effect of this we must consider that this heat is not given out gradually and regularly for three months1 but whenever there is a sudden fall of temperature vapor is condensed1 latent heat becomes sensible1 and the suddenness and intensity of the fall are diminished4 ,we need also to bear in mind that every open body of water is sending up its clouds of vapor constantly4 ,the open lakes1 and especially the sea1 are like a seething caldron2 and thus immensely more vapor is condensed during the winter months than is brought over from summer to winter4 ,much of the vapor formed in winter is to be set to the account of summer1 for it is the summer's heat absorbed by the water1 which maintains its temperature and enables it to throw up such clouds of vapor1 even in midwinter4 ,but this comes in more properly at another place1 and we will leave it for the present4 ,there is another transition experienced by water by which heat treasured up in summer is made available for softening the rigors of winter4 ,who will suggest it8 ,it is the freezing of water1 said ,mr4 ,hume4 ,in the process of crystallization one hundred and forty degrees of latent heat become sensible4 ,and this1 continued ,mr4 ,wilton1 is no inconsiderable matter4 ,every pound of water frozen upon the surface of our lakes and rivers1 every pound of water frozen in the wet earth1 every pound of water frozen as snow or sleet in the air1 gives out as much heat as would boil an equal amount of water at seventy-two degrees4 ,have you never heard of setting tubs of water in cellars to keep vegetables from freezing8 ,i have1 replied ,peter4 ,i visited my grandfather two years ago1 and his cellar sometimes froze4 ,i asked him why he put tubs of water in his cellar1 but he could not tell me1 only he said that he knew that tubs of water in his cellar did keep his vegetables from being nipped with the frost4 ,can you tell us1 ,peter1 why tubs of water set in a cellar should have this effect8 ,i suppose that when the water begins to freeze it begins to give out its latent heat4 ,that is one part of the reason4 ,the water is drawn from the well at perhaps fifty degrees2 it must lose eighteen degrees of heat before it begins to freeze1 and all the heat which the water loses the air of the cellar gains4 ,and then1 as you said1 as soon as the water begins to freeze latent heat begins to become sensible4 ,every pound of water frozen sets free heat enough to raise a pound of water through one hundred and forty degrees4 ,but why do not the vegetables begin to freeze as soon as the water8 ,i don't know4 ,water holding salt or other minerals in solution freezes at a lower temperature than pure water4 ,for this reason the juices of vegetables and fruits and the sap of trees may be cooled below thirty-two degrees without freezing4 ,on this account the water set in cellars tends to prevent vegetables from freezing2 the water begins to freeze at thirty-two degrees1 while potatoes and turnips may be cooled a little lower than thirty-two degrees without harm4 ,in this manner the buds of trees are sometimes warmed and protected by the coating of ice which forms around them4 ,the drops of water1 falling through the sleety air1 touch upon the twigs of trees and freeze upon them1 an icy coat embracing them all around4 ,in freezing1 the water gives out one hundred and forty degrees of heat1 a part of which goes to the air and a part to the twig4 ,this reminds me1 said ,ansel1 of what the ,irishman said on being told that snow contains heat1 that 'it would be a blessed thing for the poor if one could tell how many snowballs it would take to boil a tea-kettle4' ,it might be difficult to use snowballs to boil the tea-kettle1 but the heat given out in the formation of the snowflakes is doubtless employed quite as usefully for the poor as if used in preparing their tea4 ,you have all noticed that before a snow-storm1 or perhaps during the early part of the storm1 the temperature generally becomes milder1 and you have often heard the remark1 ',it is too cold to snow4' ,men have learned that the coming of a snow-storm is attended by a warming of the air4 ,this popular impression is philosophical1 yet few understand its philosophy4 ,a foot of snow falls1 equal to two or three inches of water4 ,in the condensation of the vapor which formed this snow one thousand degrees of latent heat become sensible1 and then in the congelation of the clouds into snowflakes one hundred and forty degrees of heat are evolved4 ,this softening of the rigors of winter is1 ,i think1 as great a blessing to the poor as the heating of the tea-kettle4 ,let us make an estimate of the amount of heat set free in the production of one great snow-storm4 ,two feet of snow falls1 equal1 we will suppose1 to five inches of water4 ,in the condensation of the watery vapor one thousand degrees of heat are evolved1 and in the congelation one hundred and forty degrees--an amount of heat which would boil three feet of cold spring water4 ,in every square mile there are #bg1hgh1djj square feet1 and a square mile of water three feet in depth would contain #hc1fbe1bjj cubic feet4 ,the production of such a snow-storm sets free for every square mile of surface heat which would boil more than #hj1jjj1jjj of cubic feet of spring water4 ,such a storm sometimes extends over a region of country a thousand miles square1 that is1 over a million of square miles4 ,in the production of one such storm--a very heavy and extensive storm1 ,i have supposed--heat is generated which would boil eighty millions of millions 7#hj1jjj1jjj1jjj1jjj7 of cubic feet of spring water--an amount altogether too vast for our comprehension4 ,to accomplish this result by combustion would require more than #ejj1jjj1jjj of tons of anthracite coal--an amount at least three times as great as the yearly product of all the coal-mines of the world4 ,and this is but one heavy storm4 ,the amount of rainfall in the ,united ,states may be thirty-six inches or forty or forty-five inches4 ,supposing the average rainfall of the whole earth to be twenty-four inches--an estimate very far below the truth--we have this result3 ,there are1 in round numbers1 two hundred millions of square miles of surface1 more than five and a half quadrillions 7#e1ege1fhj1jjj1jjj1jjj7 of square feet and more than eleven quadrillions of cubic feet of water4 ,the condensation of this amount of vapor would boil more than sixty quadrillions of cubic feet of ice water4 ,one pound of anthracite coal burned under the most favorable circumstances will boil sixty pounds of ice water4 ,to boil sixty quadrillions of cubic feet of ice water would require sixty quadrillions of pounds of coal--thirty billions of tons--not less than twenty-five tons to every inhabitant of the globe4 ,at this rate a very few years would exhaust the coal-fields of the world4 ,calculations like these are useful in showing upon how stupendous a scale the ,creator carries on his operations4 ,but we must remember that these works are carried on1 not to amaze men1 but to benefit them4 ,the works go on silently and unseen1 challenging no attention from fools1 receiving no thought except from the patient student of ,nature1 and eliciting no thankful recognition save from a few reverent worshipers4 ,but ,i have been led away from a point which ,i had in mind4 ,while considering the effect of heat in expanding bodies1 ,i reminded you that water presents a marked peculiarity1 and promised to speak of it more fully4 ,this is the place for us to look at this singular and beautiful peculiarity of water4 ,what is the general principle touching the effect of heat upon bodies8 ,heat expands bodies and cold contracts them1 answered ,ansel4 ,water both illustrates this rule and presents some very interesting apparent exceptions4 ,it contracts by cold like other bodies till it reaches the temperature of thirty-nine and a half degrees2 it then begins to expand1 and expands regularly till it falls to thirty-two degrees2 at that point it freezes1 and in freezing it expands at once about one-ninth of its bulk4 ,if the cooling process be continued1 the ice produced contracts like any other solid4 ,this peculiarity of the interrupted and unequal expansion of water is of the utmost importance in the affairs of our world4 ,consider the result if the water were to contract by cold as do other bodies down to the freezing point and below it4 ,water is cooled from the top by contact with the cold air4 ,as the upper film of water cooled it would sink and a new stratum be brought to the surface2 that in turn would be cooled and sink1 and thus the cooling process would go on with the utmost rapidity till the whole body of water should be reduced to the freezing temperature4 ,then congelation would begin1 and the first particles of ice formed would sink to the bottom1 and as fast as the water became frozen at the top the ice would sink4 ,in this manner a solid body of ice would be formed at the bottom of our lakes and rivers1 while the surface would remain unfrozen in contact with the cold air till the whole body of water became a compact mass of ice4 ,great lakes turned to solid ice would not be thawed during the whole of the summer1 for the water warmed from the top would not sink1 but would form a warm stratum of water upon the surface1 while1 below1 the solid ice would lie hardly feeling the summer heat4 ,nay1 more2 in the higher latitudes it would seem as if the very ocean must be turned to solid ice1 never to be melted till the end of time4 ,by the singular expansion of water below thirty-nine and half degrees and its great expansion in congelation1 these disastrous consequences are prevented4 ,our lakes are cooled even in winter only to thirty-nine and a half degrees2 below this temperature the colder water is lighter and remains upon the surface2 ice floats upon the surface4 ,the top becomes ice1 but the great mass of the water remains at thirty-nine degrees1 and the inhabitants of the waters live on unharmed4 ,spring comes1 and the ice1 being upon the surface1 is soon melted1 and the unbound waves begin again to ripple forth their unconscious joy4 ,do you look upon this irregular expansion and contraction of water1 asked ,mr4 ,hume1 as a real exception to the rule that heat expands bodies8 ,not at all4 ,in freezing1 a new force comes in and asserts itself--the force of crystallization2 or1 more exactly1 as the force of heat diminishes the force of crystallization becomes predominant1 and throws the atoms into new positions and new relationships4 ,to this new arrangement of atoms is due the expansion in freezing4 ,ice contracts and expands by cold and heat the same as any other solid4 ,the attraction of crystallization begins1 doubtless1 to throw the atoms into their new and crystalline arrangement at the temperature of thirty-nine and a half degrees4 ,we must remember that the heat which is set free in the condensation of vapor and in the freezing of water is absorbed in the formation of vapor and the melting of water4 ,as much heat is taken from summer as is conferred upon winter4 ,the summer is cooled as much as winter is warmed4 ,the formation of vapor is a cooling process4 ,water is prevented from rising above the boiling point by the formation of vapor4 ,perspiration cools us by the evaporation to which it gives rise from the whole surface of our bodies4 ,and the higher the temperature1 the more rapid the evaporation1 and the more vigorous the cooling process4 ,we might look at other appliances for transferring heat from summer to winter1 but they belong in principle to another department4 ,we have now looked at some of the means for transferring heat in time4 ,the heat is treasured up at the heated noonday1 to be brought out for use during the cool hours of night2 it is garnered from the excessive heats of summer to supply the deficiencies of winter4 ,it is laid up in store to-day to be expended at any future time when needed4 ,the transfer is a transfer not in space1 but in time4 ,we must hereafter examine those arrangements by which heat is transported through space4 ,some of these arrangements exert an influence upon day and night and upon summer and winter1 and thus throw further light upon the subjects already discussed4 ,already more than once topics have been suggested and their full consideration put off till some more fitting time4 ,in our next lesson we must begin the examination of these new principles4 ,we have before spoken of the vicissitudes of days and seasons and years4 ,we shall now have to do with the vicissitudes of zones and lands and seas1 of deserts and mountain ranges4 ,the elements become vaster1 the stage is broader1 and the movements more sublime4 ,i am glad that you are so well interested in these great and beautiful works of ,god's wisdom and power1 but ,i hope that you do not forget that the crucified ,christ is pre-eminently the power of ,god and the wisdom of ,god4 ,these natural works are but the husk of which salvation from sin by ,christ is the kernel4 ,these outward things are wonderful and beautiful for the setting1 but the gem1 the royal precious stone1 the ,koh-i-noor1 the 'mountain of light1' for which the setting was made1 is the true knowledge of the true ,god and of his ,son ,jesus ,christ4 ,during the past few weeks you have heard others asking1 ',what shall we do to be saved8' ,i should be greatly guilty if ,i allowed you to think earth1 air1 and sea1 with all their silent and solemn movements1 more important than our spiritual attitude toward ,god the ,father and ,christ the ,saviour4 ,are you1 ,samuel1 in your interest in studying ,nature1 forgetting ,christ and the souls of men8 ,i hope not1 and ,i think not4 ,during the three years since my baptism ,i have never felt so much my obligation to ,christ as now4 ,i never felt before so deep a desire that my friends should repent and believe in ,jesus4 ,i think the love of ,christ constrains me4 ,i have not felt before that my work was very important2 ,i have been expecting to work more earnestly by and by2 but lately ,i have felt that ,christ gives me something to do now for which he holds me responsible4 ,what have you tried to do for ,christ8 ,i have been praying for some of my young friends1 and especially for ,ansel and ,peter4 ,and then ,i felt that ,i must talk with them as well as pray for them4 ,and can you1 my young friends1 be careless about your own salvation while ,samuel is so anxious for you8 ,are you contented to live 'having no hope and without ,god in the world'8 ,is your happiness here and hereafter more important to ,samuel than to yourselves8 ,we are interested1 said ,ansel4 ,we have been talking together about being ,christians1 but we don't know what to do4 ,they said1 broke in ,samuel1 that they wished ,i would ask you to preach a sermon and tell them what they must do to be saved4 ,they wished to go on with these lessons1 but they thought that perhaps you would be willing to preach a sermon just upon that subject4 ,you know that ,i often speak of that subject1 and when persons have come to the inquiry-meeting ,i have told them what they must do4 ,but ,i know that there must needs be 'line upon line4' ,if ,ansel and ,peter wish it1 ,i will devote a sermon to the subject1 and make it as plain as ,i can4 ,hardly anything gives me more pleasure than to explain the way of salvation when ,i know that my hearers are interested4 ,we do wish to have you preach upon that subject1 and ,i am sure that you will have a great many interested hearers besides ,ansel and myself4 ,but1 ,samuel1 did you not pray for ,mr4 ,hume also1 and talk with him8 ,i prayed for him1 but ,i was afraid to speak with him4 ,i have tried to pray for him a double portion because ,i could not speak with him4 ,tears gathered in ,mr4 ,hume's eyes2 the thought came to him that his unbelief had raised a barrier between himself and both ,god and his people4 ,this pious young man was afraid to come to him lest he should meet the scornful arguments and cold derision of a proud unbeliever4 ,he felt humbled--he1 a subtle1 well-read unbeliever1 and ,samuel a pious lad yearning for the salvation of his soul1 but daring only to pray in secret for him4 ,have not you1 ,mr4 ,hume1 been treating ,christ and the ,holy ,spirit as ,samuel feared that you would treat him8 ,perhaps so1 he answered4 ,i am sorry that ,samuel did not come to me freely4 ,i think he need not be afraid of me now4 ,i also hope you will preach the sermon which ,ansel and ,peter wish to hear4 ,mr4 ,wilton assured them that he would do as they wished unless the ,spirit clearly drew him to some other subject4 ,i always look1 he said1 to the ,holy ,spirit for direction in my preaching4 ',when he1 the ,spirit of truth1 is come1' said ,jesus1 'he will lead you into all truth4' ,this was fulfilled pre-eminently1 ,i suppose1 in the inspired men who laid the foundation of the ,church1 but the ,spirit still dwells in believers and leads those who love and follow ,christ4 ,the preacher of the gospel can do nothing without the power of the ,spirit of ,god4 ,and ,i1 kind reader1 will give you the outline of the sermon if the ,spirit bids him preach it4 ,,chapter ,,xi4 ,,an ,,effective ,,sermon4 ,mr4 ,wilton preached the sermon spoken of at the close of the last chapter the next ,lord's ,day morning4 ,the more he thought upon the matter and inquired the mind of the ,spirit1 the more he felt that for a purpose the ,spirit was calling him to unfold again the authority of ,god and the conditions of salvation4 ,he gave notice of his subject1 and invited all good men to pray that he might be able1 like a good and wise steward of the mysteries of grace1 to bring forth out of the treasure-house things new and old1 and that the word might prove as a nail fastened in a sure place by the ,master of assemblies4 ,much prayer was offered1 and the people came together in a spirit of unwonted solemnity and earnestness4 ,mr4 ,wilton prayed to the glorified ,redeemer for his blessing3 ,o thou exalted ,christ1 we assemble in thy name and by thine authority4 ,thou hast bidden us not forsake the assembling of ourselves together for thy worship and the preaching of thy gospel4 ,by thy grace we enjoy another of these sacred days4 ,by thy death thou didst purchase for thy people eternal redemption4 ,thou hast wrought out for them a great and glorious salvation4 ,for thy great love wherewith thou hast loved us thou didst empty thyself of divine glories1 and madest thyself a servant among servants1 and didst suffer in the garden1 and die upon the cross1 and enter the grave4 ,now thou art exalted at the right hand of the ,father1 a ,prince and a ,saviour1 to give repentance and remission of sins4 ,o thou that judgest men1 thy justice is great and glorious as thy mercies4 ,years ago we tested thy love1 years ago we felt the shadow of thy wrath2 our guilt made us afraid and we cried unto thee1 and thou forgavest our sins1 and didst shed abroad thy peace in our hearts4 ,in these recent days thou hast brought other sinners to feel their guilt4 ,they have seen thee upon the cross1 and have been smitten with anguish1 and have repented1 and thou hast received them4 ,others are bowed down2 they mourn2 they feel themselves poor and needy2 they confess thy justice2 they feel the need of thy salvation2 they walk in darkness2 they grope and find no light2 they look unto thee from a distance2 but they do not come to thee1 they do not follow thee4 ,wilt thou not draw them to thyself8 ,wilt thou not bow their pride of heart and turn their wills and make their hearts tender1 gentle1 and believing8 ,wilt thou not smite the rock1 and cause the waters of penitent grief to flow8 ,lay thy cross1 ,o ,jesus1 upon their shoulders and upon their hearts1 that they may bear it after thee and share thy glory4 ,open thou their eyes that they may see eternal destinies and look upon thy divine glories1 thy beauty1 and thy tenderness4 ,let them follow thee and trust in thee1 strengthened and comforted by thy rod and thy staff4 ,o ,christ1 for thine eternal love with which thou hast loved us1 reach down thine arm mighty to save and lift us up4 ,lord1 save or we perish4 ,and speak thou by thy servant to-day1 and cause all that hear to recognize the message not as his1 but as thine4 ,he read as his text ,acts xvi4 #cj3 ,sirs1 what must ,i do to be saved8 ,he briefly recited the arrest1 imprisonment1 and release of ,paul and ,silas4 ,the salvation for which the jailer cried out was not deliverance from the dangers of the earthquake1 nor from the displeasure of the ,roman governor4 ,this was the bitter cry of a soul sinking under a load of guilt and trembling at the thought of ,god's impending wrath4 ,some of you can appreciate his feelings and his fears4 ,your sins against ,god and ,christ and the ,holy ,spirit have risen up before you2 they stare you in the face2 they condemn you4 ,you feel your guilt--not a light and trifling fault1 but guilt deep and dark1 such as creatures made in the image of ,god incur by rebellion against the blessed and holy ,creator4 ,the ,holy ,spirit has recited the divine law in your ears4 ,your consciences have heard that voice and echoed its condemnation4 ,you desire to escape that divine displeasure2 you desire to have the fires of guilt that burn in your consciences quenched4 ,you cry out1 ',men and brethren1 what shall we do8' ,the answer must be drawn from many parts of the ,holy ,scriptures4 ,understand1 in the first place1 that you are not to be saved by searching out some plan of salvation for yourselves4 ,ask for the old paths4 ',he that entereth not by the door1 but climbeth up some other way1 the same is a thief and a robber4' ',other foundation can no man lay than that is laid4' ',there is but one name given under heaven among men by which we must be saved4' ,understand also that it is useless to attempt to save yourselves by making yourselves righteous4 ,you have tried1 ,i doubt not1 to make yourselves better4 ,perhaps you have resolved that you would not come to ,christ till you can present yourselves in some degree worthy of his care4 ,have you succeeded in getting rid of your sins8 ,can you blot out your past sins8 ,can you erase the record which stands written in the book of remembrance on high8 ,the law of ,god written in this ,bible condemns you2 ,god condemns you2 you are condemned already for not believing in the name of ,god's only begotten ,son1 the ,lord ,jesus from heaven4 ,can you change that condemnation by your feeble1 fickle resolutions to reform8 ',can the ,ethiopian change his skin or the leopard his spots8 then may ye also do good that are accustomed to do evil4' ,be assured also that it does not belong to you to change your own hearts4 ',ye must be born again2' 'except a man be born again he cannot see the kingdom of ,god4' ,but that second birth comes not of blood1 nor of the will of the flesh1 nor of the will of man1 but of ,god4 ',ye must be born again1 but ye must be born of the ,spirit4' ,notice that the word saved is in the passive voice4 ,sinners do not save themselves2 they must be saved by another2 they must be saved by one able to save1 by one almighty to save1 from the wrath of ,god and from sin1 by one able to do for those who trust in him all that they need to have done in order to make their salvation complete and glorious4 ,christ is able to do this4 ,the crucified and risen ,christ is exalted a ,prince and ,saviour1 to give repentance and remission of sins4 ,the word of ,god says1 ',to give1' and he rejoices to give4 ,on one point we must pause and dwell with special clearness4 ,every anxious sinner must not only feel his guilty and lost condition1 but he should also thoroughly understand what he means when he asks what he must do to be saved4 ,he should see to it that he wants that salvation which ,jesus gives4 ,in the ,scriptures the sinner who would be saved is called upon to return to ,god4 ,he has gone astray4 ,he must retrace his steps4 ,what is meant by this8 ,i mean that man's sin consisted at first and consists to-day in saying1 ',i will1' and ',i will not1' in opposition to the will and command of ,god4 ,god said1 ',thou shalt not2' man said1 ',i will4' ,god says1 ',thou shalt2' sinners say1 ',i will not4' ,if a sinner is to be saved from sin1 this opposition must cease4 ,when ,god says1 ',thou shalt not1' the sinner must reply1 ',i will not1' and when ,god says1 ',thou shalt1' the sinner must answer1 ',i will4' ,the sinner's 'will' and 'will not' must agree with ,god's 'shall' and 'shall not4' ,in place of your self-will you must put ,god's will2 that is1 repentance1 a turning about1 a returning to ,god4 ,but remember1 salvation1 if it be real and thorough1 is not submission for an hour1 a day1 or a year1 but submission for ever and ever4 ,it is submission without condition and without limits4 ,the sinner says1 ',this is a hard saying1' this utter and boundless denial of self-will and selfishness4 ,but is it hard that the creature should yield to the ,creator1 that ignorance should yield to wisdom1 that selfishness should yield to love1 that sin should yield to holiness1 that poor1 lost1 wretched1 fallen man should yield to the eternal and ever-blessed ,god8 ,it is only by yielding that his will is brought into sweet harmony with the will of ,god1 and that he can be a sharer of the divine blessedness4 ,your views on this point should be clear and distinct4 ,if you wish only to be saved from the penalty of your sins1 you do not desire the salvation which ,jesus gives4 ,he saves his people1 not in their sins1 but from their sins4 ,if1 however1 you really wish for his full and glorious salvation1 you will desire that your will may be wholly subdued to the will of ,god4 ,you will be found ready to unite in the memorable prayer of the ,lord ,jesus1 ',not my will but thine be done4' ,salvation implies the giving up of self-will and a reverent submission to the will of ,god4 ,other sinful passions oppose the grace of ,god1 but chiefly as helpers and supporters of self-will4 ,pride and vanity strengthen self-will4 ,turbulent fleshly lusts urge on and back up self-will4 ,fear of man1 fear of danger1 and unbelief are but props of self-will4 ,when 'my ,lord ,will-be-will' submits1 the town of ,mansoul returns to her rightful allegiance4 ,the question at issue between ,god and the sinner1 the question of self-will or submission1 is often contested around the performance of some single definite duty4 ,the ,holy ,spirit often presents to the convicted sinner's conscience some single duty and presses its performance4 ,that duty is a test of the feelings and desires of the sinner's heart4 ,so the ,spirit understands it1 so the sinner often understands it4 ,as1 in the garden of ,eden1 ,god gave to ,adam a test command1 so does he now press upon the conscience of convicted sinners test duties to show them what they are4 ,that which is required may be important1 exceedingly important1 in and of itself1 or it may be in itself of very little consequence1 but in every case the duty is all-important and its performance absolutely essential1 because the ,spirit has laid it upon the sinner's conscience4 ,it will show whether he wishes for salvation from sin or not4 ,i used to hear a ,christian relate an experience like this4 ,while the ,spirit of ,god was striving with him and conviction of sin was heavy upon him1 he felt a clear impression that he ought to go to his barn1 and there at one certain place upon the hay-mow kneel and pray4 ,his self-will rose in rebellion1 chiefly1 it would seem1 because it was laid upon his conscience as a duty4 ,but his distress grew upon him4 ,he went to his barn and stood at another place and tried to pray1 but no light or peace came2 his sense of his sins grew heavier4 ,how could it be otherwise8 ,he went to the spot where he thought that he ought to go1 and stood and prayed4 ,still no peace came1 but increasing sense of sin4 ,at length he thought1 ',why should ,i not8 ,why not give up my own will8 ,why not pray that ,god's will may be done8' ,he yielded1 he kneeled at the place where he had thought he ought to kneel1 and there he first felt peace before ,god4 ,this was a singular experience4 ,perhaps a man more intelligent and better taught in the ,sacred ,scriptures would never have such a thing pressed upon his conscience4 ,but the battle of self-will is commonly fought around some single definite duty4 ,that duty may be a confession of wrong done to a neighbor1 or conversation with an impenitent associate1 or a public confession of sin before the great congregation4 ,whatever it may be1 it shows the sinner his heart and leads him to decide to follow his own will just as he had always been accustomed to do1 or it will lead him to pray earnestly that he may be enabled in everything to bow his will to the will of ,god4 ,he will want the full salvation which ,jesus in his grace brings men--salvation from the penalty of sin and deliverance from its power4 ,i draw no bow at a venture and speak not doubtfully when ,i say some of you are standing face to face with duties pressed upon you by the ,holy ,spirit4 ,your self-will1 supported by pride1 and fear of man1 and unbelief1 and ,satanic temptation1 refuses to yield4 ,the yoke of ,christ seems to you like bondage4 ,the cross is supremely heavy4 ,you draw back from it1 and refuse to bear it4 ,i cannot take away the cross which the ,spirit bids you bear4 ,i dare not do it2 ,i will not do it4 ,as the messenger of ,christ1 ,i repeat the voice of the ,spirit and lay the duty1 whatsoever it may be1 upon your consciences4 ,do you really and honestly wish to be saved from sin8 ,then you will yield to the ,spirit's kind and gracious movings2 you will yield humbly but heartily4 ,if1 however1 you want something else than the salvation which ,jesus gives1 what can you expect but perplexity1 difficulty1 darkness8 ,i beseech of you1 deal truly and faithfully with yourselves on this point4 ,to those who wish really to be saved ,i have good news to proclaim4 ,there is a ,saviour such as you need4 ,trust in ,jesus as your ,saviour4 ,place the whole work of your salvation in his gracious hands4 ,christ saves sinners just such as you are4 ,the faith which you are but to exercise is nothing else than your confidence1 by which you entrust yourselves to him4 ,faith has no saving virtue in itself1 but it is the hand by which the sinner takes hold of ,christ4 ,with this duty few of you will have any great difficulty4 ,when once you wish to be saved from sin and are ready to submit to the will of ,christ1 you will have no reluctance to take him for your ,saviour4 ,you believe that ,christ is a divine ,saviour4 ,if saved at all1 you expect to be saved by him who died on ,calvary4 ,hardly for the world would you resign your opportunity of coming to ,christ and receiving his grace4 ,you believe that ,jesus is the ,christ1 the ,son of the living ,god1 the great sacrifice for sin4 ,it remains that you should gladly accept what he offers and follow him as loving1 trusting disciples4 ,follow the ,spirit1 and you will be led to ,jesus and will come speedily to the joy of salvation2 resist the ,spirit1 and you grope in boundless darkness and fall upon the dark mountains4 ,in the ,holy ,scriptures the question of the text is asked and answered many times4 ,hardly any two answers are alike4 ,are there different conditions and different duties required of different men8 ,by no means4 ,but the ,holy ,spirit adapted the answer to the different spiritual states of the various inquirers4 ,the answer is made to each questioner's heart4 ,a self-righteous young man came to ,jesus asking1 ',good ,master1 what good thing shall ,i do that ,i may inherit everlasting life8' ,jesus answered1 ',keep the commandments3 thou shalt do no murder2 thou shalt not commit adultery2 thou shalt not steal2 thou shalt not bear false witness2 honor thy father and thy mother2 and thou shalt love thy neighbor as thyself4' ,the young man answered1 ',all these have ,i kept from my youth up2 what lack ,i yet8' ,jesus said1 ',if thou wilt be perfect1 go sell that thou hast1 and give to the poor1 and thou shalt have treasure in heaven1 and come1 follow me4' ,the young man went away sorrowful4 ,jesus knew his self-righteousness1 and gave him answers which opened that young man's eyes to see himself4 ,he gave him a test command1 and the young man's revulsion from that duty showed that1 notwithstanding his self-confident claim to righteousness1 his riches filled all his heart4 ,if your hearts are filled with the love of the world1 you must put your possessions out of your hearts and follow ,jesus4 ,nicodemus also came making the same inquiry4 ,he must have asked something like this1 for ,jesus answered such a question4 ',ye must be born again2 ye must be born of the ,spirit1' said ,jesus4 ,nicodemus was looking for a legal salvation by outward formal services1 but ,christ gave him to understand that salvation involves a great spiritual renovation wrought by the ,holy ,spirit1 by which men old in sin become new creatures and enter the kingdom of ,god as little children4 ,he taught him thus that salvation was only from ,god4 ,if any of you are looking for a cloak of self-righteous religious duties which you can put on1 be assured that true religion springs from a work of ,god wrought in the heart4 ,you must be born again by the power of the ,holy ,spirit4 ,you must become new creatures in ,christ ,jesus4 ,on the day of ,pentecost the great company of men 'out of every country under the whole heaven1' while listening to ,peter's pungent address1 cried out1 ',men and brethren1 what shall we do8' ',repent and be baptized1 every one of you1 in the name of the ,lord ,jesus1 for the remission of sins1' answered ,peter4 ,here were men who had a hand in crucifying ,christ1 or if they had no active share in that deed of darkness1 they had consented to his death2 they were partakers of the crime2 very likely they had cried1 ',crucify him1 crucify him4' ,they saw their sin1 and were pricked in the heart4 ,well might they repent of their rejection and crucifixion of their promised ,saviour1 the ,son of ,god1 from heaven4 ,others were devout men who had come to ,jerusalem to worship4 ,like ,simeon they may have waited long for the consolation of ,israel4 ,how easy for them to enroll themselves among the followers of ,christ6 ,all alike are commanded after repentance to put on ,christ by baptism4 ,that burial with ,christ was the symbol of their dying and living again--of their dying unto sin and living again unto ,god4 ,the same duties are enjoined upon you4 ,repent of your long rejection of the grace of ,god and his ,son ,jesus ,christ1 and before ,god and men devote yourselves to his service by a public confession of ,christ in baptism4 ,the jailer of ,philippi was taken in the midst of his sins4 ,he was holding the servants of ,christ in his dungeon4 ,he knew for what offence they had been seized1 and he made himself a partner in the crime of persecuting them by the zest with which he thrust them into the inner prison and made their feet fast in the stocks4 ,his conscience was ill at ease4 ,then came the earthquake's shock1 and he felt as if called to stand face to face with his ,judge4 ,his soul was pierced through and through with a sense of guilt4 ',what must ,i do to be saved8' he cried in the bitterness of his conviction4 ',believe on the ,lord ,jesus ,christ1 and thou shalt be saved1' answered ,paul4 ,this is the answer to all of you who are well convicted of sin and have given up all self-righteous hopes4 ,christ saves you4 ,look to ,christ1 ask ,christ2 whosoever comes to him he will in no wise cast out4 ,will you not come to him8 ,will you not trust his promises and commit yourselves to his hands to be saved8 ,he waits to bless you4 ,he delights to be gracious4 ,to save sinners he lived among men1 and died and has ascended4 ,his hands are full of gifts4 ,he comes to you1 and stands and knocks at the door of your hearts4 ,will you bolt the door8 ,there is joy in heaven over repenting sinners4 ,this alone of all earthly transactions carries joy to ,christ and the angels4 ,accept of ,christ1 and earth and heaven will throb with a common joy4 ,these words were listened to with most earnest attention1 for at that time ,christ and heaven were realities in the minds of men1 and salvation was a living issue4 ,mr4 ,wilton spoke as an earnest man1 without cant or circumlocution1 pressing upon men of thought and conscience the great concerns of eternity4 ,the full result of this discourse will be known only when the opening of the books at the last day shall reveal it1 but the beginning of the result was seen in the evening prayer-meeting4 ,when the invitation was given for anxious persons to make known their feelings1 both ,ansel and ,peter arose1 and confessing in few words that the ,spirit of ,god had been striving with them1 and that they had been resisting the ,spirit1 said that now they were determined to resist no more1 and asked ,christians to pray for them that they might be able to submit fully to the ,lord ,jesus and trust entirely in him4 ,then there was a pause4 ,mr4 ,wilton was just on the point of rising to close the meeting when ,mr4 ,hume rose to his feet4 ,after a sudden start of surprise1 a deep hush passed over the congregation1 and in the midst of deepest silence ,mr4 ,hume said3 ,i have been more than merely an impenitent man3 ,i have been an unbeliever2 ,i have been an infidel4 ,i have not only tried to disbelieve the ,holy ,scripture1 but ,i have actually disbelieved4 ,i have thought myself wiser than the word of ,god4 ,i do not mean that ,i have enjoyed peace1 that my conscience has been at rest1 and that ,i have been happy in my unbelief4 ,three months ago ,i began to grow more than usually discontented with myself4 ,questions which ,i counted settled and put to rest for ever came back to trouble me4 ,a hundred times a day the questions came1 ,what if there be a ,god who holds me responsible8 ,what if there be a future life and a judgment day8 ,what if ,christ be the ,son of ,god8 ,why such questions should haunt me day and night ,i could not tell4 ,i have learned to believe that the ,spirit of ,god was speaking to me4 ,this restlessness brought me to the church for half a day4 ,if my object was to gain rest in unbelief1 ,i could not have done worse4 ,my old arguments were unavailing to break the force of the truths preached4 ,the questions which had been sounding in my ears and echoing in my heart began to change to solemn affirmations3 ',there is a ,god2' ',there is a day of judgment2' ',appointed unto man once to die1 and after that the judgment2' ',christ is risen4' ,texts of ,scripture learned in my boyhood and forgotten long years ago came back fresh to my memory4 ,but ,i will not stop to rehearse to you all my struggles of mind for two months past4 ,for a few weeks you have seen me here4 ,i determined that ,i would try to find ,christ if he manifests himself to men in these latter days4 ,for two weeks ,i have tried to pray1 but ,i have found no satisfaction4 ,christ has not manifested himself4 ,my darkness has grown deeper and deeper4 ,i have sometimes almost determined to abandon all thought of ,christ and throw myself back again upon my former unbelief4 ,but ,i could not lay down the subject4 ,since ,i began to try to pray ,i have felt1 faintly at first1 like the whisper of a suggestion1 but becoming clearer and stronger1 like a voice from heaven1 that ,i must in this congregation confess my former state and the feelings which ,i have had4 ,it seemed to me that ,i could not do this4 ,it seemed easier to die than to stand up here and confess that my belief1 which ,i had pressed upon others and had boasted of as better than the gospel1 had given me no peace4 ,to-day ,i have been made to understand that the ,spirit of ,god has set me face to face with this confession4 ,i have seen what it means to be saved--that my self-will must die or ,i must bid adieu to ,christ and hope4 ,i cannot live and die hopeless4 ,i cannot rest my head upon unbelief4 ,i confess to you that all my thoughts have been wrong4 ,my beliefs and my unbelief have done me no good4 ,my whole life has been enmity and opposition to the ,holy ,spirit4 ,i will try to oppose the ,spirit no more4 ,i know not what the ,spirit may lay upon me1 ,i know not how soon ,i may break my resolution1 but ,i now feel that ,i want to be saved from sin1 and cannot do otherwise than follow the ,spirit though ,i dwell in darkness for ever4 ,if ,christ reject me ,i cannot complain1 but if you think there is hope for one who has so despised the grace of ,god1 ,i entreat you to pray for me4 ,it is needless to say that from scores of family altars and closets supplications went up to ,god that night for the salvation of ,mr4 ,hume and ,ansel and ,peter1 and men prayed especially that ,mr4 ,hume1 who for years had been such a tower of strength to the ungodly and the dread of ,christians1 might be saved for the glory of ,christ and the confounding of unbelievers4 ,those prayers were heard4 ,when the report of that meeting and that confession went out through the community1 unbelievers were silent4 ,it was as if the ,god of battles had emptied his quiver into the hearts of his enemies4 ,,chapter ,,xii4 ,,transfer ,,of ,,heat ,,in ,,space4 ,we now turn our attention1 said ,mr4 ,wilton1 to a new theme4 ,in the vicissitudes of day and night and of summer and winter heat is transferred in time4 ,we now are to look at the arrangements by which heat is transferred in space4 ,but since the transfer of heat in space requires more or less of time1 the means employed are such as suffice to accomplish both objects4 ,heat is treasured up and carried away to distant regions1 and delivered up for use as occasion demands4 ,in a previous lesson the inclination of the earth's axis was spoken of4 ,by this means the northern hemisphere of the earth is turned somewhat toward the sun during one half of the year1 and receives a correspondingly larger portion of heat1 while during the other half of the year the southern hemisphere is turned toward the sun and is warmed4 ,this inclination of the earth's axis to the plane of its orbit gives us the change of seasons4 ,the change of seasons is manifestly designed for the welfare of man4 ,along with the genial warmth of summer1 fruits and grains and the comforts of life are carried far toward the poles1 into regions which otherwise would be desolate with perpetual frost4 ,but these extremes need to be softened2 otherwise1 the violence of the changes would prove destructive rather than beneficent4 ,the severity of these annual changes of temperature is ameliorated by some of the grandest movements and arrangements upon our globe4 ,these arrangements we have in a very imperfect way already examined4 ,but there are other inequalities of temperature besides those of day and night1 summer and winter4 ,passing from the equator toward the poles1 every degree of the earth's surface passed over causes the sun to sink one degree from the zenith toward the horizon1 and gives a corresponding lower temperature1 till within the polar circles for a part of the year the sun is entirely hidden and winter reigns without a rival4 ,the temperature of the sea differs from the temperature of the land2 the sun comes nearer to one hemisphere than the other1 and remains longer north of the equator than south4 ,these and many other differences upon the earth give to different parts of the world every possible variety of temperature and climate4 ,these differences of temperature upon sea and land1 from zone to zone and from hemisphere to hemisphere1 are equalized or ameliorated by many agencies1 but chiefly by a transfer of heat in space1 a transfer of heat from place to place4 ,i do not need to tell you that while we in the northern hemisphere are enjoying the warmth of summer the southern hemisphere is enduring the severities of winter1 and in turn1 when winter comes to us1 summer smiles upon the nations that live south of the equator4 ,you also remember that the orbit of the earth is not an exact circle1 but an ellipse1 that is1 what is sometimes called in common language a long circle4 ,for this reason the earth is three millions of miles nearer the sun in one part of its orbit than when in another part4 ,can you tell us1 ,peter1 at what season of year the earth is nearer the sun8 ,in midwinter1 or about the first of ,january4 ,i have always remembered it because it seemed so strange to me1 when ,i learned it1 that the sun should be nearest the earth at the coldest season of the year4 ,yes1 one is reminded by it of the humorous argument that the sun must emit cold instead of heat1 because when we are at the point of the earth's orbit which is nearest the sun it is winter1 and the higher one ascends upon mountains toward the sun1 the colder he finds it4 ,but this nearness of the sun while south of the equator would naturally give the southern hemisphere a warmer summer than the northern4 ,for this there is a beautiful compensation4 ,the earth passes through her orbit more rapidly when nearer the sun1 and that half of her orbit is also smaller1 so that1 as the result of this1 the sun remains north of the equator about eight days longer than in the southern hemisphere4 ,the sun is nearer while in the southern hemisphere1 but the summer is shorter4 ,that which the southern hemisphere gains in distance it loses in time1 and that which the northern loses in distance it gains in time4 ,the nearness of the sun while south of the equator1 the shortness of the summer1 and the corresponding distance of the sun and length of the winter would tend to give the southern hemisphere great extremes of heat and cold1 a short and hot summer and a long and cold winter4 ,for this also there is a most interesting compensation in the comparative amount of land and water north and south of the equator4 ,much more than one-half of the dry land lies in the northern hemisphere4 ,this would tend to give the northern hemisphere extremes of heat and cold4 ,south of the equator there is comparatively little land and much water1 which tends to give the southern hemisphere evenness of temperature4 ,the inequalities of the earth's orbit and the earth's motion in its orbit we find counterbalanced by the arrangement of land and water upon the earth's surface4 ,in connection with this we may notice still another compensation in the elevation of the lands by which the burning heat of the torrid zone and the rigors of the colder zones are more or less diminished4 ,the greater the elevation of any region of country1 the cooler must be its climate4 ,physical geographers like ,baron von ,humboldt and ,guyot have made calculations which show that those grand divisions of the earth which lie in the hot regions of the earth are most elevated above the sea level4 ,south ,america lies higher than ,north ,america1 ,asia is more elevated than ,europe1 and ,africa is more elevated than ,asia4 ,the continents rise as they approach the equator and sink toward the sea level as they come nearer the poles4 ,as these colder lands approach the water level their valleys sink beneath the sea1 their coast lines become deeply indented with bays and gulfs1 and lakes abound4 ,thus the warmer waters of the sea are interspersed among the cooler lands1 and the temperature of the lands is raised4 ,the very elevation of the continents and the configuration of the lands have a providential relation to the temperature and climate of the world4 ,we cannot suppose that arrangements like these1 so aptly fitted to the needs of man1 came by chance4 ,in the unmeasured ages past1 while this earth was in preparation for man1 ,god had the beneficent end in view2 nay1 in the very beginning1 the whole plan and its beautiful completion was had clearly in mind4 ,millions of ages ago the great ,creator tenderly considered the comfort and well-being of the human race1 the latest born of his creatures1 in these last ages4 ,as a general statement1 the torrid zone receives an excess of heat1 while the frigid zones receive too little1 and the temperate zones1 lying between1 receive1 at different times and places1 sometimes too little and sometimes too much4 ,the providential arrangements for equalizing temperature are1 then1 chiefly arrangements for conveying heat from the overheated tropical regions and scattering it over the temperate and polar regions4 ,first among these means we will notice the trade-winds1 or1 as for the sake of brevity they are often called1 'the trades4' ,will you tell us1 ,samuel1 how winds are caused8 ,the air is heated at some place and expands2 it becomes lighter and rises1 while the colder air around rushes in to fill its place4 ,you use the words which are commonly employed in explaining the origin of winds1 and very likely your idea is right1 but the language needs a little correction4 ,the warm air does not rise of its own accord1 so to speak1 but is pressed upward4 ,the warm air is expanded2 it presses outward and upward2 the same weight of warm air occupies more space than cold air2 the warm air rises and overtops the surrounding air1 and then flows off in order to reach the common level4 ,the column of warm air is lighter than the cooler air1 and cannot balance it2 consequently1 the cold air sinks down1 pressing the warm air upward4 ,in this manner an ascending current of warm air is formed1 and also currents of cold air flowing from every direction toward the warm centre4 ,these currents continue until the temperature of the air is equalized4 ,the atmosphere is commonly believed to be forty-five or fifty miles in height1 though some men have estimated its height as very much less than this1 while others believe it to be six or seven hundred miles in height4 ,are we to suppose that the column of heated air reaches to the top of the atmosphere8 ,i think not1 answered ,mr4 ,hume4 ,the rarefaction of the lower part of the column renders the whole column lighter than the air around1 and the warm air1 as we know by the movements of the clouds1 after rising a little way1 spreads off in every direction1 forming upper currents corresponding to the currents below1 but moving in the opposite direction4 ,only a few days ago1 remarked ,peter1 ,i saw in the same part of the sky clouds moving in exactly opposite directions1 and others which seemed to be standing still4 ,i knew how one layer of clouds might be moving north and another layer moving south1 but ,i did not understand why some should be standing still4 ,do you imagine1 ,peter1 that the upper and lower currents of air1 moving in opposite directions1 come sharply together1 the one sliding against the other8 ,i think not1 said ,peter4 ,supposing1 then1 as is certainly true1 that a stratum of still air lies between the upper and lower winds1 does not that explain how certain clouds might be standing still while the others were moving8 ,i might have thought of that myself4 ,but how does this carry heat from the warmer region to the colder regions around8 asked ,ansel4 ,i see how the colder air coming in would cool the warm region1 and how the warm ascending air would carry away the excess of heat1 but how do the cooler regions get the advantage of this heat8 ,that is just what ,i was on the point of explaining4 ,do you remember what was said about the production of cold by expansion and of heat by compression8 ,i remember that if air be rarefied by removing pressure from it1 its temperature falls3 ,i think you said that a part of its sensible heat becomes latent2 and if air be compressed1 its temperature rises4 ,i have seen experiments with the air pump and condenser to prove this4 ,that principle explains the transfer of heat by winds4 ,if the heated air rose to the upper regions1 and there radiated its heat1 nothing would be gained2 the heat would be simply radiated into space4 ,but as the warm air rises pressure is more and more removed from it2 it expands2 its sensible heat becomes latent and is thus kept from radiation2 its temperature falls1 but not from loss of heat4 ,this rarefied air forms the upper current flowing away from the heated centre4 ,in due time this air must come to the surface of the earth again4 ,whenever this takes place the air is brought again under pressure2 it is compressed1 and its latent heat becomes again sensible4 ,heat is thus transferred from the warmer region to the colder in a latent condition1 so that it cannot be lost4 ,we must now apply this to the trade-winds4 ,what are the trade-winds1 ,mr4 ,hume8 ,they are regular winds blowing from a little north and south of the tropics of ,cancer and ,capricorn south-west and north-west toward the equator4 ,these winds are called trade-winds1 continued ,mr4 ,wilton1 on account of their great advantage to trade or commerce4 ,the regular and steady sweep of these winds bears the merchantmen rapidly and safely on their way4 ,the formation of 'the trades' is easily explained4 ,by the intense heat of the sun under the equator the air is greatly expanded and rarefied2 the heated air rises along the whole line of the equator2 from both sides the cooler air presses in1 is heated1 and rises2 thus steady winds are formed from the tropics1 or a little beyond the tropics1 toward the equator4 ,if the earth had no rotation upon its axis1 these winds would blow directly toward the equator1 exactly south and north4 ,the rotation of the earth gives the trade-winds their oblique1 south-west and north-west direction4 ,suppose that a single particle of air at the tropic of ,cancer starts upon its journey toward the equator4 ,at its starting it has the same motion eastward as the surface of the earth at that place1 that is1 about nine hundred and fifty miles per hour4 ,but as it moves on southward the degrees of longitude become longer and the motion of the earth's surface becomes more rapid1 till at the equator its motion is one thousand and forty miles per hour4 ,but the particle of air we are watching is not fastened to the earth's surface1 and as the earth moves more rapidly the nearer we come to the equator1 the particle of air falls behind1 that is1 the air moves southward and eastward1 but the earth moves eastward more rapidly than the air1 so that the air falls behind and seems to be moving westward4 ,the result is that the air upon the earth's surface moves south-west4 ,that which takes place with a single particle takes place with the whole body of the air1 and that which takes place north of the equator takes place south of it also1 producing north-west winds4 ,on reaching the equator the winds from the north and the south meet and stop1 forming the equatorial calms1 and mingling together1 they rise into the higher regions4 ,in rising1 the air bears away heat from the torrid zone1 and this heat1 rendered latent by the expansion of the air1 is carried north and south by the upper currents as far as the limits of 'the trades4' ,in due time these upper currents descend and their latent becomes sensible heat1 and is used in raising the temperature4 ,mr4 ,hume1 can you suggest any method by which we can estimate the amount of heat which is carried north and south by the return trades8 ,i know of no method1 except to estimate the amount of heat necessary to raise that flood of air which pours in from the temperate zones to the equatorial heat4 ,that immense amount of heat must1 nearly all of it1 be carried away to the temperate regions4 ,this is the general explanation of the trade-winds4 ,you must understand1 however1 that1 in certain regions and under certain conditions1 the trades are liable to interruption or change of direction4 ,desert regions within or near the tropics give rise to local winds which overpower the trades4 ,in ,southern ,asia1 while the sun is north of the equator1 the land becomes so much hotter than the sea under the equator that the trade-wind is overpowered and reversed1 forming a wind which blows to the north-east instead of the south-west4 ,but this is only a beautiful flexure1 so to speak1 of a general arrangement for the greater advantage of a particular region4 ,by this means the summer winds of ,southern ,asia come from the sea4 ,northern winds would have been dry4 ,prevailing northern winds would have made the whole of ,southern ,asia a desert2 but the south-west monsoons come from the ,indian ,ocean laden with vapor1 and render ,southern ,asia a very garden for fertility4 ,the next great agency for equalizing temperature between the torrid and temperature zones is the formation and condensation of vapor4 ,this comes in here1 because it depends for its efficiency upon the agency of winds4 ,more than once this method of conveying heat from place to place has been hinted at1 but deferred till we came to the proper place to speak of winds4 ,the trade-winds1 passing over from a colder to a warmer climate1 are constantly accumulating vapor4 ,under the equator the annual evaporation from the surface of the ocean is set down at fifteen feet1 or half an inch daily4 ,the formation of this vapor consumes heat which would boil more than eighty feet of ice water4 ,the vapor thus formed is borne upward by the ascending current of heated air4 ,on reaching the higher regions a portion of it is condensed and forms a belt of clouds around the earth4 ,this belt of clouds along the equator is known as the 'cloud-ring4' ,this cloud-ring shields the belt of calms from the burning rays of the sun and sends down almost incessant rains4 ,but does not that condensation which forms the cloud-ring set free latent heat1 and thus intensify the great heat of the equator8 ,latent heat becomes sensible1 but it is given out into the ascending current of air1 and serves only to give it another lift till by expansion of the air it again becomes latent4 ,the heat is simply transferred from the vapor to the air4 ,the vapor which remains uncondensed is borne away on the wings of the return 'trades' to the south and to the north1 and in due time is condensed and returns to the earth as rain2 the heat which is given out by its condensation1 wherever and whenever it is condensed1 is given over as latent heat to the keeping of the air1 and is passed back for use whenever the air descends to the earth4 ,vapor gathered from sea or land is everywhere exerting this equalizing influence upon temperature4 ,does the temperature rise in any place8 ,vapor is formed4 ,every moist body begins to give up its moisture1 and the excess of heat is employed in turning this water into vapor4 ,this is the method by which perspiration cools man or beast2 whether it be insensible perspiration from the invisible pores of the skin1 or perspiration standing in beady drops upon the face of the toiling laborer1 vapor is formed and heat is carried away4 ,have you not noticed on close1 muggy days when nothing dries1 showing that very little vapor is forming1 that perspiration seems to have no cooling effect8 ,it oozes from the skin1 but does not evaporate1 and hence does not carry off the surplus heat4 ,animals like dogs and oxen1 that do not become wet with perspiration1 do not bear heat well2 they soon pant and loll1 attempting to get rid of the excessive heat through the moist breath and open mouth4 ,the sum-total of heat transferred by this agency is too great for comprehension4 ,look at the ,amazon rolling to the ocean a flood broad as an arm of the sea4 ,that great river is brought from the ,atlantic ,ocean on the shoulders of the trade-wind4 ,as the vapor is slowly lifted by the rise of the land from the sea level to the summits of the ,andes1 it is condensed1 and falls as rain4 ,well is it for ,south ,america that the ,andes were thrown up on the western coast1 for the winds west of the mountains are dry as a pressed sponge1 and the most of that narrow slope is barren and desolate4 ,south ,america would be a desert if the ,andes ran along the eastern coast4 ,look at the ,mississippi1 and the great rivers of ,europe1 and the matchless rivers of ,southern ,asia4 ,all the rivers of the world represent only the wastage of the rain which falls upon the land after supplying the wants of the vegetable kingdom and keeping the lands moist4 ,all this water is lifted into the air by heat1 and every movement of vapor is a movement of heat4 ,every particle of vapor goes freighted with heat4 ,every cloud driven across the sky represents the transfer of heat1 and every transfer is in the direction of equalization4 ,everywhere the tendency is to equilibrium4 ,nature has no processes for transferring heat from colder to warmer regions4 ,we may form a conception of the amount of heat transferred by the agency of vapor by estimating the amount of heat-force required to evaporate the water which forms our rain-clouds and lift them into the upper regions4 ,according to a calculation of ,mr4 ,allen1 late of ,providence1 to evaporate one-eighth of an inch of water daily from that belt of the surface of the earth lying within the tropics1 and raise it five thousand feet high1 requires #d1gjj1jjj1jjj horse-power1 or one hundred and thirty times the effective force of the whole human race1 reckoning it at #bej1jjj1jjj able-bodied men4 ,but the actual evaporation from the sea within the tropics is believed to be about half an inch daily--four times as great as ,mr4 ,allen's supposition4 ,i see1 however1 that our time is nearly exhausted1 and ,i wish before closing to revert to that more important theme upon which ,i spoke this forenoon4 ,i do not know how the truths preached interested or affected you1 nor do ,i now wish to have you tell me4 ,i wish only to say that1 as the sermon was preached at your request1 ,i hope it proved applicable to you1 and that you will give the truths presented earnest attention4 ,consider them well1 and make your conclusions known this evening4 ,the conclusion which the evening made known1 you1 reader1 have already learned4 ,,chapter ,,xiii4 ,,ocean ,,currents ,,and ,,icebergs4 ,a week has passed since ,mr4 ,hume made his frank confession4 ,he went home no lighter of heart than before1 yet he felt in some respects different1 for he had attempted to do what was right in the sight of ,god4 ,but he did not feel the joy of sins forgiven4 ,he had not looked upon ,christ as a ,saviour for himself4 ,he felt that ,god had distinctly set life and death before him4 ,his doubts were gone2 the spiritual world was a reality2 ,christ stood at his right hand and ,satan at his left2 he stood where the path of destiny divided1 the one path leading up to heavenly seats with ,christ1 the other leading down to darkness and despair4 ,a voice seemed to be whispering in his ears1 ,this is the last call4 ,he went to his chamber determined1 if possible1 to settle the question of life or death before he left the place and before he slept4 ,he took his ,bible1 and on his knees turned and read the ,psalms at random4 ,but the cloud of darkness only gathered deeper4 ,the words of ,david's penitential ,psalm caught his eye3 ,against thee1 thee only1 have ,i sinned1 and done this evil in thy sight4 ,he felt that these words of ,david were true in his case also4 ,all his long impenitence and bold unbelief had been against ,god4 ,by night and by day1 for many a long year1 before the sleepless eye of ,god1 he had lifted up his hand1 almost defying the holy ,one1 yet the lightning of ,god had not smitten him4 ,he wondered as much at the long-suffering of ,god as at his own dreadful daring of the divine wrath4 ,he had been taught better things2 he was trained to know the ,scriptures and to go reverently to the house of ,god1 but he had turned from ,christ and hope4 ,he read on3 ,deliver me from blood-guiltiness1 ,o ,god1 thou ,god of my salvation4 ,he felt that this belonged to himself more than to ,david4 ,david had shed the blood of natural life1 but he had destroyed the souls of men4 ,he had stood chief among unbelievers4 ,he had led young men into infidelity4 ,he had seen them drink in his unbelief like water1 throw off all restraint1 and rush headlong to ruin4 ,he had wrought a work of evil which he could never undo1 and for which he could make no atonement4 ,what was a confession in comparison with the ruin he had caused8 ,what could his confession do for the young men already1 perhaps1 among the lost through his influence8 ,could his late repentance call them back to life and hope8 ,would ,god forgive and raise to heavenly heights a man who had dragged others down to hell8 ,would it be possible that ,christ should fill his soul with blessedness while his victims were drinking the wine of the wrath of ,god8 ,a deep horror seized him4 ,the darkness of eternal death seemed to enfold him4 ,must he1 then1 after having caught a glimpse of life and joy1 be cut off from hope and be driven from ,god for ever8 ,this would be just1 but he felt that he could not endure it4 ,o thou great and holy ,god1 he prayed1 ,i will ascribe righteousness to thee though thy righteous wrath shall sink me to hell2 but1 ,o thou merciful ,god1 my soul cannot endure thy justice4 ,the foretaste of thy wrath fills me with the pangs of eternal death4 ,o ,god1 have mercy upon me4 ,o ,god1 blot out my transgressions4 ,create in me a clean heart1 and renew a right spirit within me4 ,o ,christ1 whom ,i have despised1 cast me not from thy presence4 ,help me to submit to thee4 ,help me to follow thee4 ,spare me that ,i may undo something of that which ,i have done against thy glory and the souls of men4 ,o ,jesus1 ,i can do nothing to save myself4 ,o ,lord1 have mercy on me1 the chief of sinners4 ,he read the invitations and promises of ,christ1 and prayed again4 ,again he read and again he prayed4 ,little by little the promises of ,christ stirred a feeble faith in his heart2 he felt that there was still hope for him1 and with the determination to cast himself upon the sure mercies of ,christ and to devote himself to his service1 he threw himself upon his bed1 and being wearied almost to exhaustion1 soon fell asleep4 ,when he awoke it was broad daylight4 ,he had slept a sweet1 refreshing sleep4 ,but he was refreshed not merely in body4 ,he woke to a new world4 ,his heart was filled with sweet thankfulness4 ,how beautiful1 he said1 is ,god's world6 ,i never saw it so before1 but the earth and sky seem clothed in glory4 ,but most wonderful of all is ,god's goodness to me4 ,i have rebelled against him all my life1 yet he has loved me and sought for my salvation1 and now the sunlight of his love has broken through the thick clouds of my sin1 and a day of hope and joy has dawned upon my life4 ,christ has indeed revealed himself4 ,blessed be his holy name for ever and ever6 ,what shall ,i render unto the ,lord for all his benefits8 ,i will take the cup of salvation and call upon the name of the ,lord4 ,i will pay my vows now in presence of all his people4 ,i will teach transgressors thy ways1 and sinners shall be converted unto thee4 ,all this was known to the people1 for during the week ,mr4 ,hume had spoken of it in private and in public4 ,he had told it to ,mr4 ,wilton1 and they had rejoiced together4 ,ansel and ,peter had also regularly presented themselves at every meeting as anxious inquirers desiring the grace of ,god4 ,peter had also on his knees said from the heart1 ,here1 ,lord1 ,i give myself away1 and had received the assurance that his sins were forgiven4 ,the ,spirit of ,god witnessed with his spirit that he was born of ,god4 ,he began at once to use all his influence to bring his young friends to ,jesus4 ,the addition of two such workers as ,mr4 ,hume and ,peter1 each moving in his own circle of acquaintances1 gave a fresh impulse to the religious interest1 which was now becoming deep and pervasive4 ,especially had ,mr4 ,hume's conversion1 so clear and positive1 confounded those who had sat in the seat of the scornful1 and many came in now for the first time to see for themselves what it could be that had mastered their cold1 clear-headed leader in unbelief4 ,but ,ansel still walked in darkness4 ,he had talked with ,mr4 ,wilton1 but no light had entered his mind4 ,he said that he thought he had submitted in all things to the will of ,god4 ,he was becoming impatient that ,christ had not come to him as to others4 ,this was their condition as they came together upon the ,lord's ,day4 ,they all understood each other1 and had no need now to ask questions or make explanations4 ,mr4 ,wilton believed that the study of ,god's works would not interrupt the working of the ,holy ,spirit1 and therefore went on with his lesson as usual4 ,we have already spoken of the transfer of heat from the torrid to the temperate and frigid zones by the agency of winds and watery vapor4 ,these carry heat chiefly in a latent condition4 ,but great movements of heat take place in a sensible state4 ,in this transfer of heat1 also1 water is the great carrier4 ,the winds and vapor go freighted with latent heat above1 and the waters and wind go freighted with sensible heat below4 ,we will first examine the operation of the ocean currents4 ,not only do rivers run through the lands and hasten to the sea1 but in the midst of the oceans rivers are flowing in comparison with which the ,mississippi1 the ,amazon1 and the ,yang-tse-kiang are rippling brooklets4 ,the earth is belted by these ocean streams traversing the seas4 ,an ocean current1 called the ,gulf ,stream1 issues from the ,gulf of ,mexico between the ,florida coast and the ,bahama islands4 ,it flows northward off the coast of the ,united ,states1 gradually increasing in breadth and spreading over the ,atlantic ,ocean4 ,it is deflected by the ,new ,england coast and the great shoals off ,newfoundland1 called the ,grand ,banks1 or else by another current flowing southward from ,baffin's ,bay1 and strikes across the ,north ,atlantic1 bathing the shores of the ,british islands and reaching even to ,iceland4 ,the general outline of the ocean currents is this3 issuing from the ,south ,pacific1 a current flowing eastward splits upon ,cape ,horn4 ,the western portion1 called ,humboldt's current1 flows northward along the western coast of ,south ,america1 and is swallowed up and lost in the great equatorial current of the ,pacific4 ,this is a broad current flowing westward and covering the entire space between the tropics4 ,striking upon the eastern shores of ,asia1 this equatorial current divides1 one part flowing northward along the coast of ,asia1 the other finding its way through the many islands1 sweeping across the ,indian ,ocean1 and flowing down the eastern shore of ,africa on each side of ,madagascar4 ,doubling the ,cape of ,good ,hope1 the current continues in a north-westerly direction across the ,atlantic4 ,striking upon ,cape ,st4 ,roque1 this current again divides2 a part flows south and a part pours into the ,caribbean ,sea4 ,from the ,caribbean ,sea it issues as the ,gulf ,stream1 of which ,i have already spoken4 ,this ,gulf ,stream impinges upon the western coast of ,europe1 and pours partly into the ,north ,sea and partly flows south off the western coast of ,africa1 completing thus the circuit of the ,atlantic4 ,the currents of the ,indian and of the great ,southern ,oceans are as yet very imperfectly understood4 ,of all the ocean streams the ,gulf ,stream is most famous and best understood4 ,i shall therefore use this as an illustration of the agency of ocean currents in conveying heat and modifying climate4 ,the waters of the ,caribbean ,sea are heated by the tropic sun to eighty-eight degrees4 ,from these heated waters the ,gulf ,stream issues salter and warmer1 and of a deeper blue1 than the waters of the surrounding sea4 ,its greatest velocity as it issues from the gulf is a little more than three miles per hour4 ,as it flows northward its velocity diminishes1 its breadth becomes greater1 and its depth less4 ,it covers thus with its warm waters a broad belt of the ,atlantic ,ocean1 and extends its influence to the most northern part of ,europe4 ,you can judge of the amount of heat which is removed from the tropics when ,i tell you that the unmeasured flood of the ,gulf ,stream would swallow up three thousand rivers like the ,mississippi4 ,this one ocean stream is many times greater than all the rivers of the world4 ,we feel the warmth of the ,gulf ,stream with every wind that blows from the sea4 ,to this the ,british isles owe their mild1 moist climate and perennial greenness1 and by its influence a winter in ,iceland1 upon the ,arctic circle1 is no more rigorous than a winter in ,montreal1 twenty-one degrees nearer the equator4 ,but what is the ,gulf ,stream1 though it be fifty fold greater than all the rivers of the world1 in comparison with the whole sum of the ocean streams8 ,upper currents and under currents fill the sea4 ,they meet the explorers of the sea everywhere4 ,the navigator drops his measuring line1 and finds it swept away and drawn out by unseen currents4 ,all these movements of the waters are in favor of the equalization of temperature4 ,the cooler waters of the frigid and temperate zones are mingled with the heated waters of the tropics and exchanged for the equatorial waters4 ,the transfer of heat would not be greater if broad rivers of molten lava were flowing from the equator to the poles4 ,another agency for the transfer of heat is the movement of ice1 and especially of icebergs4 ,will you not tell us1 said ,samuel1 how these ocean currents are produced8 ,i can understand how winds are formed1 but ,i do not see that these streams in the sea could be formed in the same way4 ,i designed to speak of this1 but for the moment it had slipped from my mind3 ,i am glad that you called my attention to it4 ,i do not expect1 however1 to give a full and satisfactory account of their origin4 ,if ,i should do this1 ,i should succeed where every other man has failed4 ,i shall not attempt a full explanation4 ,by some means or other1 the waters of the ocean are thrown out of equilibrium1 and these currents are plainly an effort to restore the balance or equilibrium of the waters4 ,many influences and agencies conspire to disturb the equilibrium of the sea4 ,the attractions of the sun and moon are constantly counteracting the attraction of the earth and lifting the waters1 so to speak1 above their natural level4 ,the tides produced by these attractions of the sun and moon are the immediate cause of some of the minor local currents4 ,the winds set the waters in motion1 tending to pile them up in one place and leave the sea below its natural level at another4 ,the effect of strong winds in piling up the waters1 even upon our great lakes1 is very considerable4 ,a heavy east wind upon ,lake ,erie has been known to drive the waters toward the western end of the lake so much as to leave ,niagara ,river above the falls almost dry4 ,on the other hand1 a heavy west wind drives the waters eastward1 and produces almost a flood in the river4 ,the influence of constant winds like the 'trades' acting upon an immense expanse of water must be very much greater4 ,unequal evaporation tends to destroy the balance of the waters4 ,in the colder regions the evaporation is very little1 while within the tropics it amounts to about half an inch daily1 or fifteen feet per annum4 ,the head of the ,red ,sea is two feet lower than its mouth on account of evaporation4 ,this unequal evaporation causes also an unequal saltness1 and consequently an unequal weight4 ,the fresher and lighter water cannot balance an equal bulk of salter and heavier water4 ,when once currents are started the revolution of the earth upon its axis would affect them1 just as the rotation of the earth affects the trade-winds4 ,now1 all these various agencies1 and perhaps many others1 combine their influence to destroy the equilibrium of the waters of the ocean4 ,they unite and interweave their influence in a thousand ways beyond all human calculation4 ,the result is the ocean currents4 ,but how much is due to one cause and how much to another in the present state of knowledge no man can tell4 ,only for a few years have the phenomena of ocean currents been made the object of scientific observation and research4 ,but the effect of ocean currents in modifying climate is well understood1 and the modification of climate means nothing else than the transfer of heat4 ,this is all that ,i have to say of the rivers of the sea1 and if there are no more questions1 we will now look at the movement of heat caused by icebergs4 ,no question was asked1 and ,mr4 ,wilton continued3 ,in polar regions there must be an immense formation of ice4 ,except in the oceans1 the movements of water are chiefly movements of water in the condition of ice4 ,only for a small part of the year could water exist unfrozen4 ,immense regions of the ,antarctic continent seem to be covered with one broad glacier4 ,the ice pushes down into the sea until1 undermined by the dashing of the waves1 it breaks off1 and enormous fragments are launched upon the deep waters4 ,sir ,james ,ross saw in the southern ocean a chain of such icebergs extending as far as the eye could reach from the mast-head1 many of them from one hundred feet to one hundred and eighty feet in height and miles across4 ,captain d',urville saw one thirteen miles long and one hundred feet high4 ,its bulk was so vast that though the waves were dashing against it not a tremor was perceptible4 ,astronomic observations could be made from it as if it were solid rock rooted in the heart of the earth4 ,in the same manner icebergs are formed in the northern ocean also4 ,how much heat is given out in the freezing of water8 ,about one hundred and forty degrees1 answered ,peter4 ,in the formation of icebergs1 then1 heat is given out nearly sufficient to boil an equal quantity of cold water4 ,the icebergs float away toward the equator4 ,they come down from ,baffin's ,bay till they meet the ,gulf ,stream off ,newfoundland4 ,in the southern hemisphere they come ten degrees nearer the equator4 ,as they float toward the tropics they slowly melt1 and in their melting they exact from the air and the sea where they melt the same amount of heat which they gave up in their freezing4 ,if they melted at the same place where they froze1 there would be no transfer of heat4 ,but they are formed in the polar regions2 they give out their heat in the frigid zone1 while they melt and absorb a like amount of heat from the temperate zones4 ,in this manner the polar regions are exchanging with the temperate zones ice for water4 ,they borrow water1 rob it of its latent heat1 and send it back in the form of ice4 ,the temperate zones supply the needed heat and bring the ice back to the form of water1 when the polar regions again borrow it1 seize upon its heat1 and again send it back in the form of ice mountains4 ,the effect is the same as if thousands of railroad trains were transporting water to the frigid zones1 leaving it there to freeze and give up its one hundred and forty degrees of latent heat1 and bringing it back in the form of ice4 ,let us estimate the bulk of one such iceberg as that seen by ,captain d',urville4 ,it was thirteen miles long and one hundred feet high1 and we will suppose that it was four miles broad4 ,standing out from the water one hundred feet1 it must have sunk at least eight hundred feet below the surface4 ,this would give us the enormous bulk of 7#a1cjd1gji1abj1jjj7 one trillion three hundred and four billions seven hundred and nine millions one hundred and twenty thousand cubic feet of ice4 ,the burning of one pound of coal will generate heat sufficient to melt about five and a half cubic feet of ice4 ,to melt one such iceberg would require more than one hundred and eighteen millions of tons of anthracite coal4 ,this is the amount of heat given out in the polar region by its freezing4 ,this is the amount of heat transported from the warmer to the colder regions4 ,but what is one iceberg to the thousands which drift yearly from the frigid zones toward the tropics8 ,but even this hardly represents the entire transfer of heat by the agency of icebergs4 ,the icebergs are formed from the snows of polar storms1 and these are formed from the condensation and freezing of vapors4 ,in the process of condensation one thousand degrees of heat are given out4 ,every iceberg represents a transfer of heat sufficient to boil more than six times its weight of ice water4 ,one marked illustration of the effect of icebergs we ought to notice4 ,down through ,baffin's ,bay icebergs are constantly floating4 ,they are borne on southward till1 in the still waters of the ,grand ,banks1 between the polar current and the ,gulf ,stream1 they float around and melt and disappear4 ,to these melting icebergs the chilliness and unfailing fogs of the ,grand ,banks are due2 and not only this1 but the very existence of the ,banks is supposed to be due to the deposit of sediment1 sand1 earth1 and stone brought by polar ice4 ,i have spoken only of the polar glaciers and the icebergs formed by their pushing off into the sea4 ,but the same transfer of heat is taking place1 on a very much smaller scale and within narrow limits1 by the glaciers of the ,alps and every other mountain glacier4 ,the glaciers are nothing else than rivers of ice4 ,snow falls upon the mountain tops and valleys of the mountain sides from age to age4 ,the snow slowly changes to the structure of ice1 and by its enormous weight flows down through the gorges of the mountain sides1 till in the warmer vales below it melts and disappears4 ,we have not time to go into a full examination of all the interesting phenomena of glaciers1 but this one point you will notice and remember3 these rivers of ice--for they flow like rivers--cool the valleys and tend to warm the mountain tops2 of course upon the tops of the mountains there can be no accumulation of heat1 because1 standing out into the eternal coldness of space1 and swept by winds for ever1 and exposed by the thinness of the air to a rapidity of evaporation unknown at the sea level1 heat is caught up and borne away in a moment4 ,illustration3 ,,transportation of ,,heat4 ,page #bhh4 ,this closes this department of our theme4 ,i might have gone much more into details and given you great stores of particular facts and figures1 but they would have added nothing to your understanding of the subject1 and we can hardly afford to devote our ,lord's ,day to mastering the details of the natural sciences4 ,we have now looked at some of the methods by which the extremes of heat and cold1 in day and night1 in summer and winter1 and in the tropics and polar regions1 are mitigated4 ,the same principles operate upon the smallest and upon the largest scale4 ,if there is need for me to attempt in a formal way to awaken in you admiration for the wisdom and goodness of ,god shown in all these beneficent arrangements for equalizing temperature1 our study has been largely in vain4 ,we have only to remember that all these contrivances are the ,lord's designs4 ,he created the world2 he endowed matter with its qualities and forces1 and he gave it these qualities and forces for the purpose of using it as he has used it4 ,he planned all those contrivances by which he secures the comfort and the good of man1 and the fact that these natural agencies are fitted for moral uses in recovering sinners to holiness and blessedness is but the culmination of its adaptation to the uses of man4 ,this1 however1 does not complete our course of study4 ,a few other points will demand our attention for two or three more lessons4 ,but while we go on with our studies of ,nature1 remember that the physical was created for the sake of the spiritual2 the spiritual is more important4 ,let us not subvert the divine order and sink the high purpose of the creation to mere material agencies and contrivances4 ,to know ,god is greater and better than to understand ,nature4 ,that we might know and enjoy and glorify the ,creator was the object of our creation4 ,we cannot express it in better language than that employed in the old catechism3 ',the chief end of man is to glorify ,god and enjoy him for ever4' ,that term 'for ever' includes the present life as well as the future4 ,we ought to know1 enjoy1 and glorify ,god to-day4 ,i hope that another week may find ,ansel with some happy experience in this matter4 ,,chapter ,,xiv4 ,,combustion4--,,coal-,,beds4 ,another ,lord's ,day comes1 and no change has taken place with the class which calls for mention4 ,ansel still walks in darkness1 ready indeed on every occasion to manifest his concern for the salvation of his soul1 diligent in reading the ,scriptures1 frequent in prayer1 and giving yet no indication of a flagging of his avowed purpose to follow ,christ1 but he receives no comfort and peace4 ,a painful and distressed interest is becoming more and more concentrated upon him4 ,what will be the end of his groping in darkness8 ,this cannot last always4 ,unless the hindrance1 whatever it be1 which prevents the exercise of faith1 be seen and removed1 ,ansel will probably soon go back to his former careless state1 and1 it may be1 become tenfold more obdurate than before4 ,he will be likely1 on the one hand1 to become self-righteous from his supposed effort to come to ,jesus1 and1 on the other1 discouraged and despairing1 feeling that for him effort is vain and salvation unattainable4 ,while he remains in this state the very lapse of time is dangerous4 ,all feel concerned for him1 but no questions are asked1 and the lesson goes on as usual4 ,the method of transferring heat which we are now to examine is wholly different in principle from any which we have as yet considered4 ,i refer to the production of heat by combustion4 ,the transfer of heat by combustion cannot be compared for vastness with those great movements of heat which have before claimed our attention1 yet for the comfort and well-being of the human race combustion is exceedingly important4 ,without that command of heat which combustion gives1 man could not rise at best above the savage state1 and in fact could hardly exist upon the earth4 ,we smile at the ,grecian myth that ,prometheus stole fire from the gods and brought it to men in his reed staff1 but fire is certainly worthy of being counted one of ,god's great gifts4 ,but whence comes the heat of combustion8 ,is it a new and original generation of heat1 or is it merely a transfer8 ,will some one explain this8 ,i don't think that ,i can tell1 said ,samuel4 ,i remember the principles you have given us about the nature and production of heat1 but ,i do not know how to apply them to combustion4 ,i did not suppose that you would be able to explain all the phenomena of ,nature at sight1 yet the production of heat by combustion is not difficult to be understood4 ,the burning of wood and coal is chiefly the union of oxygen with carbon4 ,the oxygen of the air unites with the carbon of the combustible4 ,the attractive force between oxygen and carbon is very strong4 ,when they unite1 the atoms of oxygen dash against the atoms of carbon with great violence4 ,as they dash one upon another their motion is lost1 but by the laws of transmutation of forces that lost motion reappears as heat2 that is1 the motion of the atoms as they fall the one against the other is changed to that vibration of the atoms which we call heat4 ,the atoms of carbon1 in their separation from oxygen1 may be compared to weights suspended1 ready to fall4 ,let once the cord be cut1 and the weight falls and dashes against the earth2 its motion in falling is lost1 and reappears as heat4 ,so carbon is suspended1 so to speak1 waiting to unite with oxygen4 ,but how is the weight raised8 ,how is carbon brought into this state of suspense1 waiting to dash upon oxygen and develop heat8 ,that is not its natural state4 ,carbonic acid is found everywhere mingled in small proportions with the atmosphere4 ,this carbonic acid is nothing else than carbon and oxygen united in the proportion of one atom of carbon to two atoms of oxygen4 ,this is the natural state of carbon4 ,this carbonic acid is the food of plants2 it is this which supports all vegetable growth4 ,the carbonic acid is absorbed by the leaves of plants and trees1 and in the hidden laboratory of the leaf1 by what process is one of the undiscovered secrets of ,nature1 the carbon is separated from the oxygen1 the oxygen is discharged through the pores of the leaf1 and the carbon is carried into the circulation to build up the fabric of the woody fibre4 ,that which the most skillful chemist in the world cannot do1 except by indirect processes and at a high temperature1 the leaves are doing directly at the ordinary temperature4 ,vegetable growth is a deoxidizing process4 ,to accomplish this an enormous force is requisite4 ,to separate carbon and oxygen1 a force is demanded which is able to overcome their powerful attraction4 ,how shall we estimate the strength of this force8 ,in order that they may unite1 as in the explosion of gunpowder1 solid rocks are torn asunder4 ,the attraction of carbon and oxygen is strong enough to tear great rocks in twain4 ,it is this attraction which sends the cannon ball and the shell like meteors of death upon their errands of destruction4 ,this great force must be overcome2 carbon must be separated from oxygen and built into trees4 ,this is the lifting up of the weight4 ,but whence comes the force necessary to accomplish this8 ,from the sunbeam4 ,the heat of the summer's sun1 employed as force1 is used to deoxidize carbonic acid4 ,heat is used1 and used up1 in lifting the weight which in its fall shall generate again a like amount of heat4 ,the combustion of wood produces the same amount of heat as was needful to separate its carbon from the carbonic acid of the air4 ,vegetable growth is thus a cooling process2 heat is withdrawn from use as heat1 and is employed as force4 ,as force it has nothing to do with temperature4 ,the summer's heat1 employed in vegetable growth1 reappears in the blazing billets of the kitchen fire4 ,heat is condensed and solidified1 so to speak1 and placed under man's control4 ,in this solidified form heat may be laid up in store or transported at pleasure4 ,the grandest application of this principle is seen in the formation of the coal-beds4 ,at some early period in the unmeasured ages past1 the temperature of the earth must have been much higher than it now is2 the air was filled with moisture1 and carbonic acid abounded4 ,as a consequence1 there was an enormous vegetable growth4 ,this1 as we have seen1 is a heat-consuming process4 ,the heat is withdrawn from the air and employed in deoxidizing the carbonic acid4 ,this vast vegetable growth--enormous ferns and coniferous trees--fell1 and was swept by rivers or by floods into valleys1 or the beds of lakes1 or the sea2 the sediment of the waters covered it1 and there1 shut up from the air and subjected to a heavy pressure1 this vegetable mass underwent a slow transformation4 ,peter1 have you ever seen a coal-pit8 ,i do not mean a coal mine1 but that which charcoal-burners call a coal-pit4 ,i have seen them many a time4 ,tell us1 then1 how wood is burned to coal without being burned up4 ,the wood is set on end1 closely packed in the shape of a mound1 and then covered with earth4 ,fire is kindled in the middle of the pile1 and just enough air admitted through air-holes at the bottom to keep up a slow burning4 ,it burns just fast enough to heat and dry the wood without burning it up4 ,the same process1 said ,mr4 ,wilton1 went on in the formation of the coal-beds1 but very much more slowly4 ,under the pressure of earth and water the vegetable deposits lie smouldering1 not for a few days1 but probably for ages1 till nothing but the carbon remains1 and that pressed into a solid mass heavy as stone4 ,veins of coal are found interspersed with layers of earth and rock1 layer above layer1 and these layers are commonly not level1 but more or less inclined and sometimes broken4 ,this shows that a deposit of driftwood was made1 then a deposit of sand or clay1 then another deposit of vegetable material and another layer of earth4 ,at length1 by internal convulsions1 the whole surface was raised from beneath the waters1 and in due time the coal-veins were laid open1 and the coal brought out for the use of man4 ,then the force so long pent up and held in suspense is set free2 the stored-up heat of the geologic ages is brought out for use4 ,the excess of heat in that ancient period is handed down to these later times4 ,how sublime this transfer of heat6 ,it carries us back1 in imagination1 to the 'heroic ages1' so to speak1 of the history of creation4 ,by other methods heat is treasured up for a day or a year3 by this method it is kept in store for myriads of ages4 ,we see that the same natural forces were working in those early ages as to-day1 and the same benevolent ,creator was arranging the affairs of the world for man's advantage4 ,the sunbeam which streamed upon the earth long ages before man was created is to-day smelting ores1 driving machinery1 dragging ponderous trains of loaded cars1 and ploughing the seas with freighted keels4 ,this seems like a fairy-story or a dream1 but instead of that it is the soberest of philosophic and scientific truth4 ,we ought also to notice the internal heat of the earth4 ,this has been handed down from the day of creation1 it would seem1 till the present4 ,no new principle is seen in the earth's internal fires1 but a sublime illustration of the storing up of heat in a hot body and its slow radiation4 ,the origin of the internal heat of the earth we can only conjecture4 ,perhaps ,god created the various elements separate1 uncombined1 and allowed them then to combine according to their natural affinities4 ,this sublime conflagration of all the elements of the earth would generate the highest temperature which could be produced by combustion4 ,the elements would melt with fervent heat2 everything which could be vaporized by heat would be turned to vapor4 ,then radiation of heat would begin4 ,vapors would sink to fluids and fluids turn to solids2 a hard crust would be formed on the surface of the globe through which the heat of the still molten mass within would be slowly conducted and escape4 ,upon this internal heat the earth depends in no small degree for its temperature4 ,the heat generated perhaps upon the day of creation helps now to render the earth habitable4 ,that the earth was once in a fluid state and has lost a portion of its heat by radiation is indicated by several facts4 ,it is one of the received beliefs among geologists that at some period in the past the temperature of the earth was much higher than it now is4 ,the animals and plants which flourished during the ages when the coal-fields were deposited show that sea and land were warmer than at present4 ,it is believed that the change of temperature has taken place on account of the cooling of the earth from radiation4 ,the rate of radiation is so slow1 however1 that no farther sensible change of temperature can take place for thousands of generations4 ,the form of the earth also indicates that it was once fluid4 ,the earth is an oblate spheroid1 a flattened sphere1 and has that degree of flatness which a fluid mass would assume if revolving at its present rate4 ,the earth swells at the equator and rises thirteen or fourteen miles above the sea level at the poles4 ,the waters of the ocean move freely and take the same form as if the whole globe were fluid1 and the solid parts of the earth have the same degree of convexity1 which shows that it took its form from its own rotation upon its axis while in a fluid state4 ,this would also show that in the primal ages1 when the earth was in a plastic or fluid state1 it had the same rate of rotation as at present4 ,the lifting up of the mountain ranges also is best explained by supposing that the earth was once molten4 ,the earth cooled1 a crust was formed1 and by farther cooling and contraction of the molten mass within the crust wrinkled and formed mountain chains4 ,thus the higher temperature of the geologic ages1 the form of the earth as if it were a revolving fluid mass1 and the corrugation of its surface--these1 joined with its present internal heat1 point to the fact that it was once molten and fluid to its surface4 ,the benefits of this heat laid up in store on the day of creation we still enjoy4 ,before the class is dismissed1 said ,mr4 ,hume1 ,i should like to say a few words4 ,i have nothing farther to say to-day1 answered ,mr4 ,wilton1 and we should be glad to hear you now4 ,say on4 ,i wish only to say that these lessons have led me to such thoughts of ,god's wisdom and goodness as ,i never had before4 ,of course it is not strange that this should be the case with me4 ,i now look at everything with new eyes4 ,it is not merely this one element of heat in ,nature that moves my admiration1 but ,i have been led to consider a thousand things in which the goodness of ,god is shown4 ,my thoughts of the divine goodness are as fresh and interesting to me as my impressions of his righteousness and holiness are startling4 ,for years ,i have tried with might and main to look upon the dark side of the world and to exaggerate its physical evils4 ,i have searched for disorder and want of adaptation4 ,as long as ,i misunderstood the purpose of the creation1 ,i thought ,i was successful in impugning the wisdom of the arrangements of this physical world4 ,while ,i supposed that the earth must needs be the ,creator's masterpiece in beauty and pleasantness and all manner of perfections1 designed just to give sensual pleasure to its inhabitants1 ,i could find1 or thought ,i found1 many faults in the ,creator's work4 ,now ,i withdraw all my former charges4 ,my eyes are opened4 ,the rougher elements of man's life will henceforth have a new meaning to me4 ,i see that ,god seeks not so much present pleasure for men as their holiness4 ,he lays a solid foundation for their happiness4 ,he seeks to render men blessed by bringing them into likeness and union with himself4 ,these are new views to me1 and ,i thank my heavenly ,father that this new light has dawned upon me4 ,i feel now that ,i can bear the ills of this life cheerfully1 understanding that the ,lord is using them as a means of spiritual discipline4 ,it seems to me as if this lower world and man's lowly life were already glorified by a beam of light falling from heaven4 ,i hope that my young friends have been as much profited as ,i have been4 ,i rejoice with you1 ,mr4 ,hume4 ',we know that all things work together for good to them that love ,god4' ,this light has shone upon me for many years4 ,,chapter ,,xv4 ,,economy ,,of ,,heat4 ,in this final lesson ,i wish1 said ,mr4 ,wilton1 to bring before you some general views of the whole subject of the agency and management of heat4 ,when ,jesus had fed the five thousand men upon the mountain side by the ,sea of ,galilee1 he said to his disciples1 ',gather up the fragments that remain1 that nothing be lost4' ,the ,christ who spoke these words was the same ,christ by whom 'all things were created that are in heaven and that are in the earth1 visible and invisible4' ,these words inculcate the propriety of saving1 the very opposite of extravagance and wastefulness4 ,the same prudent economy we find in all ,god's works4 ,nothing is wasted4 ,god provides bountifully2 he is not stinted in his works2 we find nothing narrow or mean2 his resources are ample for all his undertakings4 ,perhaps a careless observer might charge him with prodigality and wastefulness4 ,the wilderness rejoices in beauty and fertility upon which no human eye gazes1 and which supplies no human want4 ',full many a gem of purest ray serene ,the dark unfathomed caves of ocean bear2 ,full many a flower is born to blush unseen1 ,and waste its sweetness on the desert air4' ,rich fruit grows ruddy and golden in the autumnal sun only to fall and decay4 ,how small a part of the seeds which might germinate and reproduce the parent plant ever fulfill this their legitimate object6 ,but this is not waste4 ,as for the beauty with which the unpeopled wastes are smiling1 we know not what other beings besides man 'grow glad at the sight4' ,fruits and grains and seeds were appointed as much to nourish the animal kingdom as to reproduce plants and trees4 ,and that which decays is not wasted4 ,the oak lifts high its leafy arms and does battle with the tempests for a century1 and then having served its purpose in ,nature1 if man does not call it to the higher mission of serving his purposes1 ,nature begins to pull down the structure she has reared and rebuild the elements in other forms--such forms as man perchance may need4 ,the fruit that falls and decays is not wasted2 it shall blush with golden tints in other forms and in other years4 ,god pulls down the old that he may build the new4 ,the same elements appear and reappear in a thousand shapes4 ,there is endless change1 but no waste4 ,this sentiment1 ',gather up the fragments1 that nothing be lost1' which is proclaimed throughout all ,nature1 is uttered most emphatically in the management of heat4 ,god has provided most bountiful stores of heat1 but has left no heat to go to waste4 ,will you1 ,mr4 ,hume1 suggest one of the general arrangements for the economical use of heat8 ,i think that the arrangement for economizing heat which ought to be mentioned first is the confinement of heat to the locality where it is needed4 ,will you explain that a little farther1 ,mr4 ,hume8 ,all living creatures are confined near the surface of the earth4 ,they penetrate only a few feet into the earth and soar a few hundred feet above it4 ,heat is therefore confined to the region of the earth's surface4 ,it penetrates but a little way below the surface1 and when warm air rises into the higher regions1 heat becomes latent4 ,the higher parts of the atmosphere are cold1 and in the empty spaces of the heavens the temperature is we know not how low4 ,god has provided for heating only that part of the world which needs to be heated4 ,i think you spoke of this in some one of the earlier lessons4 ,perhaps ,i did4 ,but ,i refer to it again to call especial attention to the idea of the economical use of heat4 ,who will mention another method by which heat is economized8 ,no one answered4 ,i asked the question1 but did not expect an answer4 ,god shows economy in the use of heat by accomplishing many different results by its agency4 ,i do not mean that the same identical heat accomplishes different results at the same time4 ,the same force cannot accomplish two works4 ,as man cannot spend his money and at the same time keep it1 no more can heat be used and not used up in that form4 ,the heat which raises the temperature can do nothing else at the same time1 and when it is employed as force it ceases to affect temperature4 ,but by this one agency of heat the ,creator brings very various works to pass4 ,heat expands bodies1 relaxes cohesive attraction1 and brings the chemical affinities into activity4 ,by this means the elements of ,nature are subdued to human uses1 seeds germinate1 all the processes of vegetable life go on1 and digestion and nutrition are carried forward in the bodies of animals4 ,by the agency of heat the winds blow1 the deep waters of the ocean circulate1 clouds are formed1 dew and rain refresh the earth1 rivers flow1 and all the activities of life fill the world4 ,the employment of one agency for the accomplishment of so many works indicates economy in the expenditure of force and means4 ,moreover1 the same heat appears and reappears again and again1 passing from the sensible to the latent form and back again1 asserting itself alternately in raising the temperature and as active force4 ,a beam of heat falls upon our world3 it is partly absorbed by the earth1 and warms it4 ,a part of that warmth is used in setting the chemical affinities in action in the sprouting of seeds2 a part warms the air by conduction2 a part is radiated1 and being stopped by the vapor in the air1 warms it2 the heat of the air is partly used in the evaporation of water3 the vapor formed is condensed and waters the earth1 and gives out the heat by which it was formed2 that raises the temperature of the air2 a part of it is used in deoxidizing carbonic acid and building up the forests2 the forest tree falls by the woodman's axe1 is burned for fuel1 and gives out its heat again1 or if it falls and decays1 the result is the same2 the heat given out by combustion cooks the laborer's dinner and warms his room1 or it goes out again1 and is used in preparing food for the growing wheat2 that wheat is used for food1 and by slow combustion in the blood the heat is again evolved1 the body is warmed1 and the chemical operations of digestion and nutrition are maintained2 the heat is radiated or conducted from the body into the atmosphere1 and again raises the temperature and goes to do other work4 ,at last1 so far as our earth is concerned1 it escapes into the stellar spaces1 and goes to bless other worlds4 ,in all these operations no heat-force is frittered away and wasted and lost4 ,this is one of the accepted doctrines of physical science4 ,heat is used bountifully1 but economically and without waste4 ,even the inequalities and variations of temperature must be counted economy in the use of heat4 ,the heat of midday is not needed at all hours1 and therefore it is not always provided2 the heat of summer is not always useful1 and is therefore not given2 a higher temperature for a part of the year and a part of the day is necessary1 and is bestowed4 ,the smallest amount of heat is so disposed as to accomplish the largest result4 ,keep in mind1 then1 the economical aspect of ,god's management of heat4 ,i would also have you remember how few are the principles involved in all the ways and means for transporting heat and equalizing temperature4 ,all the various phenomena which we have examined can be brought under two general principles4 ,the first principle or method is the heating and cooling of bodies4 ,bodies absorb heat2 they part with their heat by conduction or radiation4 ,if they are heated and cooled without change of place1 heat is transported in time1 but not in place4 ,if the body be removed from one place to another between the heating and the cooling or between the cooling and the heating1 heat is transported in both time and space4 ,this applies alike to solids1 liquids1 and gases2 each one is a carrier of heat in proportion to its specific heat4 ,the second principle or method is the transportation of heat by the change of sensible to latent heat and its restoration to a sensible state4 ,under this principle there are four cases3 #a4 ,heat is employed in the evaporation of liquids1 and is restored again to use as affecting temperature by the condensation of the vapor4 #b4 ,heat is employed in liquifying solids1 and becomes latent thereby1 and returns to the sensible state when the liquid solidifies4 ,these two principles find their grandest application in the changes of water3 of this application ,i have chiefly spoken2 but they apply also to other bodies--to metals as well as to liquids4 #c4 ,heat is rendered latent in the expansion of gases from removal of pressure1 and latent heat becomes sensible by the compression of gases4 #d4 ,heat is employed in the deoxidation of carbonic acid or other combinations of oxygen1 and is evolved in combustion4 ,while in the latent condition1 heat may be kept without loss for an unlimited period of time or transported from equator to pole4 ,by the various applications of these two general principles1 all the different methods of equalizing temperature are determined4 ,i would have you remember also that these processes for transporting heat and modifying temperature are not confined to the regular changes of days and seasons and the permanent differences of zones1 but apply to every possible difference of temperature4 ,one minute the sun shines out in full splendor2 the next1 a cloud hides his face and cuts off his fervent beams2 the methods employed to soften the heat of the one minute and the chill of the next are the same which equalize the temperature of the seasons4 ,evaporation carries off the heat from the seething tropics1 evaporation carries off the excess of heat from the bodies of animals and men4 ,the same methods are equally efficient upon the grandest and upon the smallest scale4 ,in this connection let me give one or two illustrations of the delicacy with which general principles adapt themselves to the minutest circumstances4 ,when the earth is wet1 it is fitting that evaporation should go on rapidly and remove the excess of water1 but when the ground is drier1 it is fitting that evaporation should be checked and the remaining moisture spared4 ,this result is secured not merely by the lack of moisture at the surface1 but also by the decreased capacity of the earth for absorbing heat4 ,a dark color absorbs heat more readily than a lighter color1 and the earth becomes1 as a general rule1 darker when wet2 and lighter when dry4 ,moist earth1 therefore1 receives heat more readily than dry earth1 and the excessive moisture is the more rapidly carried off by evaporation4 ,another more interesting illustration is presented by the odor of flowers4 ,in its place ,i told you that watery vapor hinders the radiation of heat from the earth4 ,dark heat is absorbed by it4 ,the same is true of other gases1 and also of the odors of fragrant substances4 ,a bed of flowers fills the air around with odors4 ,by these odors much of the heat radiated by the earth is stopped4 ,by this means the air around the blooming flowers is warmed4 ,the invisible fragrance raises the temperature and secures for the blooming plants a more genial atmosphere4 ,the ,lord provides for the flowers when most of all they need to be cherished by a congenial warmth4 ,this completes what ,i have to say to you upon the subject of heat4 ,i might have gone far more into particulars1 and extended these lessons over six months instead of three4 ,we started with the design of finding out whether the works of ,nature have anything to say about a wise and good ,creator4 ,we could not examine the whole circle of ,god's works1 and therefore chose a single department--that of heat4 ,i will leave yourselves to decide whether we have found marks of divine wisdom and goodness1 whether ,nature has had anything to say to us about a ,creator4 ,it seems to me1 said ,samuel1 that if the works of ,nature do not show ,god's goodness and wisdom1 it would be hard to tell what works would show them4 ,i think ,i shall always1 after this1 look upon the earth and sky with more interest than ,i have ever felt in them before2 ,i shall always look upon them as having something to do with ,god4 ,we certainly ought1 said ,mr4 ,wilton1 to study ,nature in such a manner and with such a spirit that we shall be led to reverence and worship the ,creator4 ,some very good men are afraid of scientific study1 as if there were something in it to draw men from belief in the ,scriptures and the ,jehovah revealed in them2 and it cannot be denied that not a few unbelievers have tried to find a foundation and a defence for their infidelity in scientific studies2 but such men are not made skeptics by earnest and reverent study of ,god's works3 they were unbelievers before and aside from physical studies1 and they only try to glorify their rejection of the ,bible and ,christ by deifying science and the creation and holding them up in opposition to inspired revelations4 ,if ever you find the works of ,god separating you from ,god1 you may know at once that you misunderstand those works or come to them with a wrong spirit4 ',the undevout astronomer1' it has been said1 'is mad1' and the same might1 with good reason1 be said of every undevout student of physical science4 ,in selecting heat for our examination1 ,i did not take the only rich department of ,nature's works4 ,the practical chemist would find a richer and broader field of research1 and so would the anatomist and animal physiologist1 the geologist1 or the physical geographer4 ,i purposely chose a comparatively narrow field1 in order that our course of study might not become wearisome by its length4 ,you will find ample scope in the fields of natural science for your largest powers1 and enough to carry your thoughts reverently to the great ,creator and ,governor4 ,in one respect the study of ,nature resembles the study of the ,sacred ,scriptures4 ,it is a revelation2 it is an embodiment of ,god's thoughts2 in it ,god has expressed himself2 and ,nature1 by most suggestive symbols and types1 teaches much more moral truth and spiritual sentiment than some men think4 ,in the brute creation it gives us1 in pantomime1 all the virtues and graces and all repulsive vices and cruel passions4 ,to this book of ,nature we ought to come without prejudice1 reverently inquiring what is written therein4 ,we must study it thoroughly and interpret it as we interpret the written word1 comparing ,scripture with ,scripture4 ,it is a great attainment to be able to read and understand the thoughts of ,god embodied in his works4 ,in another respect1 the book of ,nature and the ,sacred ,scriptures have very little in common4 ,the ,bible is occupied pre-eminently with moral duties and spiritual relationship4 ,its great themes are sin and salvation4 ,christ is the great central truth4 ,one might compare the ,scriptures to a picture in which one central figure seizes every eye1 and by whose radiance the whole picture is filled with light1 and that central figure is ,christ2 or we might compare the ,bible to a sublime oratorio1 the glorious symphony of the ages2 through it all is heard one strain1 sweetly exultant as angel voices1 faintly heard at first amid the sadness of the fall1 but rising still above the terrific bass of ,sinai and its ever-repeating echoes1 growing more clear and strong upon the harps of the prophets1 till its rapturous beauty pours itself triumphant along the plains of ,bethlehem4 ,in this revelation of salvation from the guilt and ruin of sin the ,bible stands alone4 ,upon this subject ,nature is silent4 ,salvation by ,christ is the gem enshrined in the ,scriptures4 ,but what is the setting for this gem8 ,the works of ,god on the earth and in the heavens4 ,the prophets were men in sympathy with ,nature4 ,how ,david sung the praises of the divine handiwork6--',o ,lord1 how manifold are thy works2 in wisdom hast thou made them all4' ',the heavens declare the glory of ,god and the firmament showeth his handiwork4 ,day unto day uttereth speech1 and night unto night showeth knowledge4 ,there is no speech nor language where their voice is not heard4' ,how ,christ unfolded the deepest spiritual truths by the symbols of ,nature6 ,but if the casket be so worthy1 what shall be said of the gem which is enshrined within8 ,that is the pearl of great price4 ,to that book which speaks in no doubtful voice of deliverance from sin let us turn with increasing reverence2 and above all1 let us come to him who came to reveal our ,god1 who came to be as well as to make a revelation of ,god1 being himself 'the brightness of his glory and the express image of his person4' ,i am glad that you all now feel that you know him whom to know is everlasting life4 ,from these words of ,mr4 ,wilton you will conclude that ,ansel has at length found rest in ,christ4 ,in another brief chapter ,i will tell you of his experience1 and then bid you adieu4 ,,chapter ,,xvi4 ,a ,,day ,,of ,,joy ,,and ,,gladness4 ,the reader has already learned that after ,ansel had confessed himself an anxious inquirer and professed himself willing to obey ,christ1 he remained three or four weeks still in darkness4 ,others found peace in believing1 but he felt no joyful confidence that ,christ had received him and forgiven his sins4 ,he sometimes felt almost discouraged1 and sometimes was tempted to complain of ,god for not treating him as favorably as others1 or to feel chagrined because others were rejoicing1 while he found no light4 ,but he fought against these evil thoughts and insinuations of ,satan1 and did not flag in his private devotions or cease to confess himself1 always and everywhere1 an anxious inquirer1 still in darkness1 but desiring to find the grace of ,god4 ,if ever he was tempted to push away all concern about salvation and return by force to his former careless state1 the words of ,christ would come to his mind3 ,will ye also go away8 and ,peter's answer1 ,lord1 to whom shall we go8 for thou hast the words of eternal life4 ,the alternative1 salvation by ,christ or the loss of his soul1 stared him in the face4 ,i can but perish if ,i go2 ,i am resolved to try2 ,for if ,i stay away1 ,i know1 ,i must for ever die4 ,great interest was felt for him and much prayer was offered in his behalf1 but he seemed to make no progress toward a better state4 ,mr4 ,wilton had talked with him1 but had failed to discover what it was that hindered his humble acceptance of the grace of ,christ4 ,after long and anxious musing upon ,ansel's character and surroundings and the previous conversations which he had had with him1 ,mr4 ,wilton determined to probe him more fully4 ,for this reason he invited ,ansel to his study1 where the following conversation transpired3 ,good-morning1 my young friend2 how do you find yourself to-day8 ,i am feeling1 ,i think1 very much as when ,i was here a week ago4 ,are you becoming discouraged and almost ready to give up all effort to follow ,christ8 ,i do sometimes feel very much discouraged1 but ,i am not ready to give up my interest in religion4 ,have you no more enjoyment in reading the ,scriptures and in your prayer in secret than you had a week ago8 ,i think that ,i am trying to do right in doing these things1 and ,i enjoy them better than ,i should if ,i felt that ,i was doing something wrong1 but ,i do not feel as ,i think a ,christian ought to feel4 ,are your thoughts and feelings and opinions about ,christ and salvation the same as they were six weeks ago8 ,i think they are very different4 ,i am glad to hear that2 but can you tell how they are different8 ,at that time ,i felt that ,i was a sinner1 but was fighting against that feeling4 ,i wished that ,christ would let me alone1 and that the ,holy ,spirit would not trouble me4 ,but now ,i very much wish that ,i may feel my sins1 and that ,christ may come to me and save me4 ,i wish to follow the ,spirit4 ,did you expect a month ago that at this time you would be feeling and acting as you now feel and act8 ,no1 sir2 ,i meant then to fight it through1 and not let anybody know how ,i felt4 ,do you wish now that you had fought it through1 as you proposed1 and kept all your feelings to yourself8 ,i am very thankful that ,i did not keep on hiding my feelings4 ,i almost tremble to think what the result would have been4 ,you have said that you wish to spend your life in serving ,christ4 ,does it seem to you a hard and painful work--a work that you would get rid of if you could--or does working for ,christ and confessing ,christ before men seem attractive8 ,i think his service seems pleasant2 there is no other life that seems half as pleasant4 ,do you believe that ,christ is able to save you8 ,i suppose he is4 ,if he cannot save me1 there is no hope for me1 for ,i cannot save myself4 ,do you believe that he is willing to save you8 ,i think he is1 if ,i come to him and trust in him4 ,i suppose he is willing to save all who come to him4 ,are you unwilling to come to him--to trust him and submit to him8 ,i don't know2 ,i have tried to come to ,christ1 but ,i have met with no such change as ,i have always supposed that a ,christian ought to have4 ,what do you think it is that hinders your coming into light and joy as others have done8 ,i cannot tell4 ,i suppose it must be something or other in myself1 but ,i cannot guess what it is4 ,i would like to ask you a few questions which you may think rather close and personal1 and which you may find it hard to answer frankly4 ,you know the spiritual adviser1 as well as the physician1 must first of all find out the condition of the patient4 ,i am willing to have you ask any questions you please1 and ,i will try to answer them as well as ,i can4 ,did you ever think1 ,ansel1 that you were very ambitious8 ,i knew that1 like many others1 ,i was a little ambitious1 but ,i never thought that ,i was very much so4 ,perhaps you were more ambitious than you thought4 ,you know that you would work day and night rather than not stand at the head of every class you were in4 ,on the play-ground you asserted your position as leader in every game4 ,did you not carry the same idea of being chief into your plans and expectations for the future8 ,you were ambitious of standing the very first whatever course of life you might follow4 ,was not this so8 ,i don't know3 ,i can't deny it2 ,i think it was4 ,it is possible1 ,ansel1 that you are trying to carry the same ambition into the kingdom of ,christ4 ,perhaps you have wished in conversion some brilliant experience which would draw attention to you4 ,tell me how this is4 ,would you be satisfied to have a commonplace experience1 such as thousands of others have1 which would attract no special notice8 ,have you not formed an idea of the great and brilliant change you must pass through1 and are you not refusing to take anything else from the ,lord's hands8 ,tears gathered in ,ansel's eyes1 and his face worked painfully4 ,at length he answered3 ,your question is a hard one to answer1 but ,i cannot deny it2 ,i am afraid it is so4 ,i have heard persons tell of the great load of sin like a pack on their shoulders1 and of the earth seeming as if it would open and swallow them up1 of sleepless nights and unspeakable anguish1 and then of light and joy1 so that they could never doubt that they were converted4 ,i have been expecting that ,i was to have such an experience1 but ,i have not seen it4 ,is it wrong to wish for such an experience8 ,it is certainly wrong to insist upon such an experience4 ,god leads each one to himself in his own chosen way4 ,there was but one ,saul1 whom ,christ met and blinded with the dazzling light4 ,as a general rule1 when a sinner makes up his mind in what way he will be converted1 the ,lord will disappoint him4 ,if he fixes in his mind that he will not come to an anxious-seat1 or will not confess his feelings till he can say that his sins are pardoned1 or will not do anything else1 the ,lord will very likely bring him to do the very thing he resolved that he would not do4 ,if he attempts to bring his ambitious aspirations into ,christ's kingdom1 he will be disappointed4 ',the first shall be last and the last first4' ,men become great in ,christian service by counting themselves the least of all1 and humbling themselves to become the servants of all4 ,you need to examine yourself in this matter4 ,if you have looked for something great and startling1 be contented with something small and commonplace4 ,it is an unspeakable privilege to be brought into ,christ's kingdom in any manner4 ,it is sometimes a great blessing to have a very unmarked and plain style of conversion4 ,such a convert is compelled to look to the truly scriptural evidences of a change of heart instead of resting upon the evidence1 often deceptive1 of a great and sudden illumination or a fancied voice from heaven4 ,some of the greatest and best of men have been unable to tell at all the time of their conversion4 ,richard ,baxter could not tell even the year of his change4 ,the best experiences ,i have known have been those where the converts could tell very little about themselves2 they had been doing something else besides looking into themselves to watch the motions of their own thoughts4 ,i will try to do as you say4 ,but what kind of evidence am ,i to look for8 ,the same kind of evidence which you now look for in me or any other ,christian4 ,it is not one thing to come to ,christ and another thing to follow ,christ4 ,the best evidence that a sinner has come to ,christ is that he actually follows ,christ and serves him4 ',by their fruits ye shall know them4' ',bring forth fruits meet for repentance1' said ,john the ,baptist4 ,bring forth fruits that show that your thoughts about sin1 and about ,christ1 and about the service of ,christ have been changed4 ,look for the same kind of evidence in yourself that you would look for in any stranger whom you should meet4 ,but above all things take the words of ,jesus as true and rest on them2 consecrate yourself to ,jesus with all the heart2 with lowliness of mind hold yourself ready for any work or any sacrifice2 you will find that evidences will take care of themselves4 ,when men come into sympathy with ,christ1 when they believe his words1 walk with him1 and talk with him1 and bear the cross with him1 when they enter into a partnership of service and suffering with ,christ1--the ,spirit bears witness with their spirits that they are born of ,god4 ,i will try to follow your advice1 and am very thankful that you have spoken about my ambitious spirit4 ,another caution ,i wish to give you4 ,do not think that you1 by any methods or by cherishing any spirit1 are to make yourself fit to be saved4 ,if you are saved at all1 ,christ must take you as a sinner1 and a great sinner4 ,if you get rid of your spirit of pride1 it will be by ,christ's saving you from it4 ,let me also suggest to you that which a consideration of your associations suggested to me1 that you may have stumbled at the idea of baptism4 ,you must have heard baptism spoken of very disrespectfully1 and it is possible that you may have learned to look upon it as a humiliation and a reproach4 ,you may have recoiled from the thought of submitting to it4 ,that was my feeling once1 but since ,i have been willing to have my feelings known ,i have ceased to be afraid of what those who despise religion may say4 ,be careful now1 since you feel that your sympathies are with the ,christian band1 that your love of greatness does not lead you to resist the ,spirit4 ,be willing to be small4 ,be thankful for small gifts4 ,i trust that your present feelings will before long give place to a humble trust1 a childlike confidence1 and a holy boldness in ,christ1 and that your usefulness in the kingdom of ,god will be all the greater because he now requires you in the beginning to trample under foot your budding pride and die to all human ambitions4 ,when ,ansel gave up the idea of a wonderful conversion1 a sudden illumination which should bring with it something of eclat1 he found that he could understand the ,scriptures better and have more enjoyment in his religious duties4 ,while he humbled himself1 hoping for little1 he found his soul soon filled with a deep1 quiet joy4 ,the next ,saturday afternoon was the regular time for the covenant-meeting1 and also1 according to custom1 for hearing the experiences of any who wished to unite with the church by baptism4 ,ansel1 ,peter1 and ,mr4 ,hume came1 along with others1 to present themselves to the church4 ,in regard to ,mr4 ,hume there had been much speculation among his former comrades as to what course he would take4 ,some said3 ,mr4 ,hume will never wet the sole of his foot in that river4 ,don't you remember how he used to laugh at the idea of being plunged in the river in honor of a dead man8 ,he may talk in meeting1 but it is a very different thing to go down into the river with the whole hillside covered with people4 ,others said3 ,we can't tell what has come over him1 but he will not go back now4 ,he has gone too far to retreat4 ,some even ventured to approach ,mr4 ,hume himself with their raillery3 ,what do you think now of being dipped in the river in honor of a dead man8 ,i think that ,i would be willing to be baptized a thousand times if ,i could recall by that means what ,i have spoken against baptism4 ,and what1 ,mr4 ,hume1 about the ice water8 ,you know and ,i know1 he answered1 that we always respected those who did not shrink from cold water for ,christ's sake4 ,what effeminacy1 what more than effeminacy1 for a resolute man to hesitate and tremble at baptism6 ,we should be ashamed of such weakness in any worldly matter4 ,i have given you occasion for all your raillery1 but as ,i once was a leader in evil1 so ,i wish that ,i might lead you to better things4 ,ansel1 ,peter1 and the rest gave an account of their religious experiences1 and last of all ,mr4 ,hume4 ,what leads you1 asked ,mr4 ,wilton1 to present yourself to the church1 asking for baptism8 ,i think that the love of ,christ leads me4 ,i have done a great deal against ,christ1 and now ,i wish1 if possible1 to do something to show my love for him4 ,i come to obey the word and example of ,christ by being buried with him in baptism4 ,they were received for baptism1 and the time of administration fixed at half-past twelve o'clock the next day4 ,the ,lord's ,day was cold and blustering4 ,many were disappointed1 for they hoped that the day would prove warm and sunny4 ,but the blustering day did not prevent the gathering of a great company by the riverside4 ,as the congregations left the churches they turned their steps toward the place of baptism4 ,ungodly men turned out1 and those who never came to hear the preaching of the gospel flocked together to see the gospel preached by this symbolic service4 ,the word had gone out that ,mr4 ,hume was to be baptized1 and this drew together his former associates4 ,at the place chosen the river swept around in a gentle curve and the bank rose up like a magnificent amphitheatre2 while just above1 the land put out into the water and threw the current upon the opposite side4 ,here gathered almost the entire population of the village to witness that simple and solemn service which from the days of ,john the ,baptist has thrilled so many hearts4 ,the candidates came warmly clad1 brought from their own homes in a close carriage4 ,gathered there1 the little band of ,christians1 surrounded by so great a cloud of witnesses1 first sang the hymn commencing3 ,thou hast said1 exalted ,jesus1 ,take thy cross and follow me2 ,shall the word with terror seize us8 ,shall we from the burden flee8 ,lord1 ,i'll take it1 ,and rejoicing follow thee4 ,then ,mr4 ,wilton read with a voice that reached all the company a few passages from the ,new ,testament which authorized and commanded that service4 ,after that he prayed that the joyful presence of ,christ might attend those about to follow him in baptism1 that believers might be encouraged1 and careless sinners awakened4 ,one by one the converts were buried with ,christ1 and one by one they came up out of the water1 forgetting all else in the joy of obedience4 ,they sang the words consecrated by use at so many riversides3 ,oh how happy are they ,who their ,saviour obey1 ,and have laid up their treasure above6 ,tongue can never express ,the sweet comfort and peace ,of a soul in its earliest love4 ,these words found a response in many hearts4 ,high up upon the river bank were gathered a little knot of mocking unbelievers4 ,one among them1 seven years before1 had publicly professed his faith in ,christ4 ,for a little time he seemed to be treading in the ,lord's ways1 but falling among evil associates1 he not only neglected ,christian duties1 but became a professed unbeliever4 ,he read infidel books and loaned them to others4 ,he sought to sow the seeds of unbelief wherever he went4 ,upon this ,lord's ,day he stood with others profanely mocking at the sacred service4 ,with shivering1 tremulous accents he exclaimed1 ,poor ,harry ,gill is very cold2 ,i would not go into the water to please any ,christ for five hundred dollars4 ,that young man went home with deep conviction of sin upon him4 ,two days after1 ,mr4 ,wilton was called at ten o'clock at night to visit him4 ,he was trembling like an aspen leaf with his deep anguish of conscience1 and for two days and nights his body shook under his fear4 ,then little by little faith took the place of fear1 and hope smiled upon him4 ,he was the next person whom ,mr4 ,wilton baptized4 ,look in upon the ,christian band assembled that ,lord's ,day evening4 ,upon the faces of those who had been baptized there was no sign that the service of that day had been painful2 if they had done the duty as a cross1 the cross must have been quickly followed by a crown of joy1 for every face was radiant with light4 ,among them was one little girl twelve years of age whose face1 as she rose from the water1 shone like the face of an angel1 and the transfiguration of that moment had hardly begun to fade away4 ,ansel was peacefully happy1 and from the face of ,mr4 ,hume the old look of dissatisfaction was all gone2 his soul had entered into rest1 and he felt at home4 ,every one of them testified that it had been the happiest day of his life4 ,they declared themselves willing for ,christ's sake to be baptized a hundred times if he commanded4 ,they had already found that in keeping his commandments there is great reward4 ,i should be glad1 kind reader1 to trace with you the ,christian course of these disciples through the years that follow4 ,but we must leave them4 ,i am sure1 however1 that their course will be upward4 ,their experience was not the mere effervescence of fickle feeling4 ,the word of ,god germinated in their hearts2 they had root in themselves4 ,they believed1 they believed the truths of the gospel1 and therefore they felt1 and therefore they acted4 ,whatsoever is born of ,god overcometh the world1 and believing that they were truly born of the ,spirit1 we are confident that he which hath begun a good work in them will perform it until the day of ,jesus ,christ4