,illu/ration3 ,i ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,,spectropia2 ,,or1 ,,surpris+ ,,spectral ,,illusions4 ,,%[+ ,,gho/s ,,ev]y:]e1 ,,& ,,( ,,any ,,col\r4 ,,by ,j4 ,h4 ,,br[n4 ,,f\r? ,,edition4 ,fir/ ,s]ies4 ,,) ,,sixte5 ,,illu/rations4 ,,london3 ,,griffi? ,,& ,,f>ran1 ,,successors ,,to ,,newb]y ,,& ,,h>ris1 ,,corn] ,,( ,,/4 ,,paul',s ,,*ur*y>d4 ,h4 ,c4 ,,trea*]1 ,,brighton4 ,,mdccclxv4 ,ent]$ at ,/ation]s' ,hall4 ,,introduction4 ,! foll[+ ,illusions are f\nd$ on two well-kn[n facts2 namely1 ! p]si/5cy ( impressions1 & ! production ( complem5t>y col\rs1 on ! ret9a4 ,! explanations are divid$ into two ,p>ts4 ,! ,,fir/ consi/s ( directions = see+ ! spectres4 ,! ,,second1 a brief & popul>1 z well z a sci5tific1 description ( ! mann] 9 :i* ! spectres are produc$1 & is int5d$ = ! use ( ^? :o may wi% to "k m ( ?is subject ?an is conta9$ 9 ! fir/ ,"p4 ,z an apology = ! app>5t disreg>d ( ta/e & f9e art 9 ! plates1 su* figures are select$ z be/ s]ve ! purpose = :i* !y are int5d$4 ,j4 ,h4 ,,br[n4 ,,old ,,/eyne1 ,,brighton4 ,,directions4 ,to see ! spectres1 x is only necess>y to look /eadily at ! dot1 or a/]isk1 :i* is to be f\nd on ea* ( ! plates1 = ab\t a qu>t] ( a m9ute1 or :ile c\nt+ ab\t tw5ty1 ! plate be+ well illum9at$ by ei!r artificial or day light4 ,!n turn+ ! eyes to ! ceil+1 ! wall1 ! sky1 or bett] /ill to a :ite %eet hung on ! wall ( a d>k5$ room 7n totally d>k71 & look+ r /eadily at any "o po9t1 ! spectre w soon beg9 to make its appe>ance1 increas+ 9 int5sity1 & !n gradually vani%+1 to reappe> & aga9 vani%2 x w cont9ue to d s sev]al times 9 succession1 ea* reappe>ance be+ fa9t] ?an ! "o prec$+4 ,w9k+ ! eyes1 or pass+ a f+] rapidly to & fro be=e !m1 w frequ5tly ha/5 ! appe>ance ( ! spectre1 especially if ! plate has be5 /rongly illum9at$4 ,^? :o use gaslight w f9d x conv5i5t1 aft] hav+ look$ at ! plate z above describ$1 to extemporise a d>k5$ room by hav+ ! gaslight turn$ l[2 or "o end ( ! room may be d>k5$ by plac+ a scre5 be=e ! gas1 lamp1 or c&le light4 ,! spectres may be easily made to appe> life-siz$ or colossal1 by hav+ ! plate ne>] ! eyes :ile receiv+ ! impression1 & by increas+ ! di/ance betwe5 ! obs]v] & ! surface aga9/ :i* !y are se54 ,z a g5]al rule1 ! obs]v] %\ld be ab\t eight to tw5ty feet f ! surface4 ,:5 ! spectres are se5 aga9/ opposite h\ses1 ! sky1 & o!r di/ant surfaces1 !y w appe> colossal4 ,%\ld any "o n be able to see ! spectre's features1 ! reason w be1 ei!r t ! eyes h be5 all[$ to w&]1 or ! head to move1 :ile look+ at ! plate4 ,_m p]sons w see "s "o col\r$ spectre bett] ?an ! o!rs1 9 consequ5ce ( _! eyes n be+ equally s5sitive to all col\rs4 ,! col\rs 9 ! plate w be f\nd to rev]se !mselves 9 ! spectres1 z expla9$ else:]e1 ! spectres always appe>+ ( ! complem5t>y col\r to t ( ! plate f :i* x is obta9$4 ,?us1 blue w appe> orange1 & orange blue1 c4 ,,li/ ,,( ,,! ,,plates4 ,,plate ,i4 ,?is w+$ figure ( ,victory w give a :ite spectre by artificial light 7r gre5 by daylight71 ! r$ wrea?s gre51 ! gre5 roses r$1 & ! orange />s blue4 ,,plate ,,ii4 ,?is black figure w give a :ite spectre4 ,,plate ,,iii4 ,?is w give a d>k spectre4 ,,plate ,,iv4 ,?is gre5 figure w give a r$ spectre4 ,,plate ,v4 ,& ?is r$ figure w give a gre5 spectre4 ,,plate ,,vi4 ,?is orange figure w give a blue spectre4 ,,plate ,,vii4 ,& ?is blue figure an orange spectre4 ,,plate ,,viii4 ,?is purple h& w give a yell[ spectre4 ,,plate ,,ix4 ,& ?is yell[ figure ( ,victory w give a purple spectre4 ,,plate ,x4 ,! face ( ?is figure w come out gre5 9 ! spectre1 ! g>m5t r$1 & ! cl\d :ite4 ,,plate ,,xi4 ,?is black skeleton w make a :ite spectre4 ,,plate ,,xii4 ,?is skeleton w also give a :ite spectre1 ) a yell[ mantle4 ,,plate ,,xiii4 ,?is figure & broom w give a yell[ spectre1 cloak & hat r$1 & moon :ite4 ,,plate ,,xiv4 ,^! figures w give gre5 & yell[ spectres4 ,,plate ,,xv4 ,?is ,cupid w give a rose-col\r$ spectre1 ) b[ & arr[ yell[4 ,,plate ,,xvi4 ,?is is a ra9b[ ) col\rs rev]s$1 ! spectre ( :i* w be f\nd a good resemblance ( nature1 especially :5 se5 on a cl\dy sky4 99 99 99 99 99 ,! col\rs ( ! spectres produc$ by ^! figures w n only be subject to a slight v>iation 9 diff]5t eyes1 b also by ! degree 9 :i* ! plates are illum9at$ :ile be+ look$ at4 ,a ,,popul> ,,& ,,sci5tific ,,description4 ,x is a curi\s fact t1 9 ?is age ( sci5tific rese>*1 ! absurd follies ( spiritualism %\ld f9d an increase ( support]s2 b m5tal epidemics seem at c]ta9 seasons to affect our m9ds1 & "o ( ! olde/ ( ^! moral afflictions--wit*craft--is once m preval5t 9 ?is n9ete5? c5tury1 "u ! contemptible =ms ( _s-rapp+ & table-turn+4 ,! mod]n pr(essor ( ^! impo/ures1 l 8 pr$ecessors 9 all su* disreputable arts1 is b5t only on rais+ ! cont5ts ( ! pockets ( ! mo/ gullible portion ( humanity1 & n ! spirits ( ! dep>t$1 ov] :i*1 z he well kn[s1 not)/&+ 8 pr(ane assumption1 he c h no p[]4 ,"o ?+ we hope 9 "s measure to fur!r 9 ! foll[+ pages1 is ! ext9ction ( ! sup]/iti\s belief t app>itions are actual spirits1 by %[+ "s ( ! _m ways 9 :i* our s5ses may be deceiv$1 & t1 9 fact1 no s-call$ gho/ has ev] appe>$1 )\t its be+ ref]able ei!r to m5tal or physiological deception1 or1 9 ^? in/ances :]e sev]al p]sons h se5 a spectre at ! same "t1 to natural objects1 z 9 ! case m5tion$ by ,dr4 ,ab]crombie1 9 8 "w on 8,! ,intellectual ,p[]s30--8,a :ole %ip's company 7 ?r[n into ! utmo/ con/]nation1 by ! app>ition ( a cook :o _h di$ a few days be=e4 ,he 0 di/9ctly se5 walk+ ahead ( ! %ip1 ) a peculi> gait1 by :i* he 0 di/+ui%$ :5 alive1 f hav+ "o ( 8 legs %ort] ?an ! o!r4 ,on /e]+ ! %ip t[>d ! object1 x 0 f\nd to be a piece ( float+ wreck40 ,a gho/1 accord+ to ! g5]al descriptions ( ^? :o fancy !y h be5 fav\r$ ) a sight ( "o1 appe>s to be ( a pale phosphoresc5t :ite1 or blui% :ite col\r2 usually indi/9ct1 & s transp>5t t objects are easily se5 ?r\gh x4 ,:5 mov+1 x glides 9 a peculi> mann]1 ! legs n be+ necess>y to its locomotion4 ,all ! s5ses are m or less subject to deception1 b ! eye is pre-em95tly s2 especially 9 ! case ( individuals :o are 9 ill heal?1 because ! s5sibility ( ! ret9a is !n g5]ally mu* exalt$1 z is also ! imag9ation4 ,we may divide ! illusions to :i* ! s5se ( sight is liable into f\r k9ds4 ,fir/1 m5tal1 or ^? aris+ 9 ! bra9 itself1 & only ref]r$ to ! eye4 ,second1 ^? produc$ by ! /ructure ( ! eye4 ,?ird1 ^? aris+ f ! impressions ( outw>d objects on ! ret9a4 ,f\r?1 ^? produc$ by v>i\s comb9ations ( ! =ego+4 ,x is only ! second & ?ird we %all h occasion to t\* ^u4 ,b be=e we c well und]/& _! nature1 x w be necess>y to get a slight k ( ! /ructure ( ! eye1 & "s idea respect+ ! nature ( light4 ,illu/ration3 ,,fig4 #a4 ,) p]haps ! exception ( ! e>1 ! eye is ! mo/ wond]ful example ( ! inf9ite skill ( ! ,creator4 ,a m exquisite piece ( me*anism x is impossible = ! human m9d to conceive4 ,! annex$ diagram 7,fig4 #a7 ( a horizontal section ( ?is organ w give a bett] idea ( its g5]al /ructure ?an :ole pages ( lett]-press4 ,x w be se5 to consi/ ( a globe ( ?ree envelopes or coats1 :i* are kept di/5d$ by ?ree transp>5t hum\rs or l5ses3 ! aque\s 7e71 ! cry/all9e 7f71 & ! vitre\s 7g74 ,! out] coat 7a7 is d5se1 :ite1 & fibr\s4 ,9 front ( ! eye x gives place to a p]fectly transp>5t "o1 call$ ! cornea 7d74 ,! next coat1 ! *oroid 7b71 is vascul>1 v black on its int]nal surface1 9 ord] t light fall+ on x ?r\gh ! pupil 7h7 may n be reflect$4 ,! pupil is an op5+ ?r\gh a diaphragm :i* is call$ ! iris 7i71 f its col\r v>y+ 9 diff]5t individuals4 ,x has ! p[] ( exp&+ & contract+ ! pupil1 = ! purpose ( regulat+ ! supply ( light to ! ret9a 7c71 or ?ird & la/ coat :i* lies imm$iately on ! *oroid4 ,x is transp>5t1 v complex1 & ! only "p ( ! eye we %all c>efully consid]4 ,! foll[+ diagram 7,fig4 #b7 repres5ts a section ( x magnifi$ #bej diamet]s1 a is call$ ! limit>y membrane1 & =ms its inn]mo/ surface1 or t :i* is next ! vitre\s hum\r2 b consi/s ( ! lay] ( optic n]ve fib]s2 c is a lay] ( grey n]ve cells2 d1 two lay]s 9 :i* ! pr9cipal ret9al blood-vessels are spread out2 e1 two lay]s ( granul> matt]2 f1 ,jacob's membrane1 or lay] ( rods & cones4 ,fig4 #c w give "s idea ( ! suppos$ connexion betwe5 ^! v>i\s p>ts1 ! same lett]s ref]r+ to ! same p>ts z 9 ,fig4 #b4 ,illu/ration3 ,,fig4 #b4 ,illu/ration3 ,,fig4 #c4 ,:5 a ray ( light ent]s ! eye1 x passes ?r\gh ! hum\rs or l5ses1 & is =m$ by !m into an image1 on ! *oroid1 ( ! object look$ at4 ,! extremities ( ! rods & cones h ! p[] ( appreciat+ ! image !re =m$1 & convey x up ?r\gh ! ultimate p>ts ( ! ret9a 7,fig4 #b71 !nce along ! optic n]ve fibres to ! bra94 ,we are incl9$ to reg>d ! extremities ( ! rods & cones z ! true seat ( p]ception1 9 consequ5ce ( obs]v+ a consid]able di/ance betwe5 ! ret9al blood-vessels & ! *oroid1 :5 p]=m+ ,purk9je's exp]im5t4,a ,?is exp]im5t consi/s 9 pass+ a light$ c&le sl[ly to & fro be=e ! eyes1 at ab\t two or ?ree in*es f ! nose1 :5 ! ret9al vessels w exhibit !mselves be=e ! obs]v] n unlike bran*+ trees4 ,!y may be se5 by daylight1 by pass+ ! l>ge tee? ( an ord9>y comb sl[ly backw>ds & =w>ds be=e ! eye1 :il/ look+ on a smoo? %eet ( pap]1 or ^u ! sky4 ,fig4 #d repres5ts ^? ( ! left eye1 z se5 by c&lelight4 ,! spot m>k$ k is ! exact c5tre ( ! ret9a4 7,! same lett] m>ks ! same spot 9 ,fig4 #a47 ,x is ! seat ( mo/ di/9ct vision4 j is ! entrance ( ! optic n]ve 7,figs4 #d & #a71 f ! c5tre ( :i* ! ret9al art]y w be se5 em]g+ & spread+ ov] ! entire ret9a2 b 9 ! diagram t "p only is repres5t$ :i* c\ld be se5 tol]ably di/9ct4 ,! backgr\nd to ! art]y appe>s ( a pale r$1 except at ! "p occupi$ by ! optic n]ve1 :]e x is :ite4 ,a ,?is di/ance c easily be p]ceiv$ by gett+ an impression on ! ret9a1 accord+ to ! 8,directions10 page #d1 & !n1 on p]=m+ ! above exp]im5t1 ! art]ial ramifications & ! c5tral spot w be di/9ctly p]ceiv$ to move ov] ! spectral figure4 ,illu/ration3 ,,fig4 #d4 ,aft] ?is rapid glance at s complicat$ a /ructure1 & be>+ 9 m9d t "s p]sons c see its sev]al p>ts ) va/ly great] facility ?an o!rs1 x _c be a matt] ( surprise t individuals n aw>e ( ^! facts are1 n[ & !n--especially at night1 & :5 c>ry+ a light ab\t--/>tl$ by :at !y fancy an app>ition1 b :i* is 9 reality no?+ m ?an "s "p ( ! /ructures above consid]$4 ,a lady assures u t %e saw ! gho/ ( h] husb& z %e 0 go+ d[n/airs ) a light$ c&le 9 h] h&4 ,! spot k1 ,fig4 #d1 :5 se5 aga9/ a wall a few feet di/ant1 appe>s ab\t ! size ( a human head1 & wants v little to furni% x ) features4 ,figur$ pap] on ! wall1 & a ho/ ( o!r ?+s1 may supply !m1 or ev5 ! ret9al art]y1 :i* (t5 l5ds body & limbs4 7,fig4 #e47 ,illu/ration3 ,,fig4 #e4 ,besides ! above-m5tion$ /ructures1 !re are o!rs :i* may play an important "p 9 ^! illusions1 especially ! common musc volantes1 s call$ f _! resemblance to fly+ flies4 ,!y consi/ ( cells & filam5ts1 ! dbris ( ! /ructures ( ! eye1 & float ab\t 9 its hum\rs4 ,t "s ( !m exi/ v ne> ! ret9a appe>s evid5t f ! fact t1 on plac+ ! eyes close to a gauze wire bl9d1 di/9ct m9iature images ( p>ts ( ! gauze w be se5 9 !m4 7,fig4 #f47 ,illu/ration3 ,,fig4 #f4 ,we n[ pass on to consid] "s ( ! lead+ prop]ties ( ,light4 ,!re h be5 _m !ories prop\nd$ f "t to "t 9 ord] to expla9 ! v>i\s ph5om5a connect$ ) ?is subject1 b only "o accords well ) all1 & t is call$ ! undulatory or vibratory !ory1 :i*1 f its num]\s complications1 w compel u to conf9e ourselves to a consid]ation ( t "p only :i* is necess>y to our pres5t use4 ,?is !ory reg>ds light z ! vibrations ( an impond]able e!r p]vad+ all space1 ! numb] ( ^! vibrations v>y+ 9 a giv5 "t = ea* ( ! ?ree prim>y col\rs--blue1 yell[1 & r$--! greate/ numb] produc+ blue1 ! lea/ r$1 & an int]m$iate numb] yell[1 all o!r col\rs be+ produc$ by ! comb9ation ( ^! 9 v>i\s proportions4 ,any two ( ! ?ree prim>y col\rs mix$ toge!r makes ! complem5t>y col\r to ! ?ird1 & ! ?ird is also complem5t>y to x4 ,?us1 blue & yell[ make gre51 :i* is ! complem5t>y col\r to r$2 r$ & blue make purple1 complem5t>y to yell[2 yell[ & r$ make orange1 complem5t>y to blue4 ,:5 ! ?ree prim>y col\rs are mix$ toge!r1 :ite is ! result3 s t :5 a ray ( :ite light falls ^u a piece ( pap]1 & all ! vibrations are equally reflect$1 ! pap] w appe> :ite1 & if !y are all absorb$1 x w appe> black2 b1 if ! pap] absorbs "s & reflects o!rs1 x w appe> col\r$4 ,?us1 if x absorbs ^? produc+ r$1 x w appe> gre51 f ! mixture ( ! vibrations produc+ blue & yell[2 & if x absorbs blue & yell[1 & reflects r$1 !n x w appe> r$4 ,9 ?is mann] any object we look at w appe> ( any p>ticul> col\r1 accord+ to :i* vibrations x absorbs & :i* x reflects4 ,! ret9a is s admirably con/ruct$ t x is susceptible ( diff]5t impressions ( col\r by ^! diff]5t vibrations1 except 9 ! case ( a few individuals1 :o are ei!r bl9d to all col\r1 & !re=e see ev]y?+ black or :ite1 & _! int]m$iate %ades1 or :o are bl9d to only "o or two col\rs4 ,:5 we look /eadily at a r$ object = a few seconds1 t "p ( ! ret9a on :i* ! image imp+es beg9s to get less s5sitive to vibrations produc+ r$1 b m s5sitive to ^? produc+ blue & yell[2 s t on turn+ ! eye away f ! r$ object1 & p]mitt+ a little :ite light to ent] x1 t "p ( ! ret9a :i* receiv$ ! r$ image w1 9 consequ5ce ( its dim9i%$ s5sibility to t col\r1 & its exalt$ s5sibility to blue & yell[1 be able to p]ceive ! two latt] col\rs be/1 & by _! mixture w give rise to a gre5 image ( ! r$ object4 ,! same ?+ w be obs]v$ ) all ! o!r col\rs2 ! second>y image or spectre always appe>+ ( ! complem5t>y col\r to ! object f :i* ! impression is obta9$4 ,! duration & vividness ( ^! impressions on ! ret9a v>y greatly 9 diff]5t individuals1 & c be procur$ f almo/ any object4 ,a p]son may1 aft] look+ /eadily1 & z (t5 happ5s1 unconsci\sly1 = a %ort "t at pr9t$ or pa9t$ figures1 on pap]1 porcela91 c41 see1 on turn+ ! head 9 "s o!r direction1 a life-siz$ or colossal spectre 7! spectre appe>s l>g] ! great] ! di/ance ( ! surface aga9/ :i* x is se571 & !re c be little d\bt b t _m ( ! reput$ gho/s orig9ate 9 ?is mann]4 ,illu/ration3 ,,ii ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,iii ,illu/ration3 ,,iv ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,v ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,vi ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,vii ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,viii ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,ix ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,x ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,xi ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,xii ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,xiii ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,xiv ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,xv ,design$ by ,j4 ,h4 ,br[n1 ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4 ,illu/ration3 ,,xvi ,design$ by ,j4 ,h4 ,br[n1 & ,publi%$ ,dec4 #ai4 #ahfc1 by ,griffi? ,f>ran1 ,s4 ,paul's ,*ur* ,y>d1 ,london4