590 



INDEX OF SUBJECTS. 



Selachians, teeth in, 259 

 Semnopithecus, teeth, "204 

 .sVy/i/M/;/i tiibercnlutiim. double (?) an- 

 tenna, 551 



.analogy with Discontinuous Varia- 

 tion, r,i; 

 3i .iial characters, statistics as to, in 



Beetle-. 38; Kai -wigs, 40 

 of Hi'iiiiilim ill Shftlaml, 254 

 of I'liiilniiiii r in Waii/iu, 251 



Sheep, ci I \ leal ,!(,! irl. -, 1 ~l'. 



215: change in form of canines, 21".; 

 molar, 210; extra horns, 285; poly- 

 dactylism, :;73. ::-s<i 



Sheep-dog, teeth, 221 



Shetlaml, variety of lli'iiinlu.* in, 254 



Shrew, nak'-d variety, 56 



Sianifsi- Twins, 560 



Siberia, Crustacea of salt lakes, 97, 100 



Silis ri(iif<>lli!<, extra legs, 498 



Silky fowls, 56 



X ///.// iiii/rita, extra legs, 501; <ir<i>ni- 

 lutn, double (?) leg, 51s 



silunia, extra tin, 540 



Simla, vertebra;, 118; teeth, 200; extra 

 di^'it, lil'.i; extra mamma, 188 



Simultaneity of Variation, possibilities 

 of, 2"). _'<;, 308 ; in fore and hind 

 wind's of Lepidoptera, 2113; in counter- 

 parts, .".<;: I; in colours of segments of 

 Lepidopterous larva;, 303 ; in Chiton 

 idffi, 307; in limbs, 402; in homo- 

 logous twins, 559: in radial segments, 

 123; not clearly distinguishable from 



S\ millet IV, ."il'.'.l 



Sinistral varieties, 54 



Situs transversus, 465, 560 



Slf-dgt--dog, absence of first premolar, 



215; division of premolar, 214 

 Snn'riiitliiis, colours of larva 1 , oct'llntus, 



jxijtiili, tilice, 306, 307 

 Snakes, vertebrae, 103. 123; axial du- 



plirity, 561 



So/, ri, pigmentation of blind side, 471 

 x,./, nnjilitirn.1 xtri'iK'iix, double (?) an- 

 tenna, 551 



Sorr.r, miked varietv, 51; 

 Spaniel, teeth, 221 

 Species, the problem of, 2. Methods of 



attacking, 6 



Discontinuity of, a fact, 2 

 Specific Din'eime.-, indefinite, 2 

 Sperinathecic of Earthworms, variation 



in number, &c. of, 160, 165 

 Sfihn Ton-inn.*, imperfect variation to 6- 



i ayed state, 437 

 Sphiiigid.-i', repetition of markings in 



larvif of, 26; variation in, 304 

 .s';i///;u- litiitxtri, division ofjiroboscis, 456 

 .spinal nerves, 12'.i; Birds, 130; Man, 

 135; Primates, 13S; I'.ra- 

 dypodida 1 , 141 ; I'lfin, 

 141; n,iiin, 142 

 dimorphism in respect of, 



138; distribution to 



limbs, 143 ; Homoeosis, 



144; recapitulation, 144 



Spinal nerves, principles of distribution, 



113 

 Spiracle, extra in tadpole of Pclolatex, 



465 



Stability, Organic, 36 

 Starfishes, theory of origin of repetition 

 in, 29; variations in number of ray-. 

 439; multiplication by fission, 433 

 Stcntor, duplicity. ">('.ii 

 .stirhiijiitx, arrangement of tube-feet 



changes with age, 435 

 Stickleback, variation in number of 



bony plates, 276 



Stomobrachium octocostatinn, variety 

 having tentacles in double series, 

 125 

 StniniiuUa, double (?) antenna, atrn. 



551, <-iili-(initii, 551 

 Strati-i/ii* iintit'iiif, extra legs, 512 

 Strut hid, brachial plexus, 130 

 Sti/i'hi, variations in branchial sac, 172 

 Siibi'iinn-iihiulit, extra eye, 27'. 

 Substantive Variation, distinguished 

 from Meristic, 23; cor- 

 related with Meristic in 

 vertebra?, 125 

 in size, 38, 40; in colour, 

 43 4S ; in colour-pat- 

 terns, 48 54; miscel- 

 laneous, 54 60 



Swan, cervical vertebrae, 33; colour- 

 variation of voung, 44 ; Inachial 

 plexus, 130 



Symmelian "monster," 459 

 Symmetry, the conception of, 19, 569 



a relation between optic- 

 al images, 19 

 almost universal pre- 

 sence of in living or- 

 ganisms, 21 

 of mamma-, 191 

 in dental Variation, 267 

 indigital Variation, Man. 

 324,402; C it, 314; in 

 manus and pes, 4u3 

 in nuclear division, 430; 

 in variations in seg- 

 mentation of ovum, 

 463 



in variations of homo- 

 logous twins, 559, .".;<) 

 in double monstrosity, 



559 



Bilateral, characters of, 

 88; as appearing in 

 variations of flat- 

 fishes, 467 



Major and Minor, 21, 86 

 Primary and Secondary, 



90 

 Kadial, characters of, S'J 



