INDEX 



[References to vol. ii have the volume prefixed.] 



Accessory idioplasm, 383. 



Acrasides, immunitj' of, 100. 



Adaptation, in leaf butterflies, ii. 346 ; 

 of the sperm-cells to fertilization, 278, 

 279 ; facultative, ii. 278 ; functional, 244 ; 

 harmonious, ii. 80, 197 ; not chance 

 hut necessitj-, ii. 346; all evolution 

 depends upon, ii. 347. 



AfSnities, vital, within the 'person,' 

 ii. 36 ; -svithin the id, 374. 



Agassiz, L,, immutability of the species, 

 16. 



Alcoholism, ii. 68. 



Aldrovandi, 13. 



Amixia, ii. 285, 286. 



Ammon, 0., the variation-playground, 

 ii. 199, 202. 



Amoeba 'nests,' ii. 219. 



Amphigony, 267 ; as a factor in maintain- 

 ing species, ii. 204. 



Amphimixis, general significance of, ii. 

 192 ; antiquity of, ii. 202 ; Amnion's 

 playground of variations, ii. 206 ; 

 Amoeba ' nests ' as a preliminary stage, 

 ii. 219; beginnings of, ii. 213; par- 

 thenogenesis as self-fertilization, ii. 

 233 ; in Coccidium, ii. 214, 216 ; chro- 

 mosomes in Protozoa, ii. 216 ; the ' cycle ' 

 idea, 326 ; increased stability due to, 

 ii. 200; continued inbreeding, ii. 231; 

 'formative' stimulus, ii. 229; Galton's 

 curves of frequency, ii. 206 ; in relation 

 to rudimentary organs, ii. 226 ; imme- 

 diate consequences of, ii. 224 ; plasto- 

 gamy as a preliminary stage of, ii. 222 ; 

 alters individuality, ii. 192 ; and natural 

 death, 335 ; direct advantages of, ii. 

 198; origin of, ii. 211; association of, 

 with reproduction, ii. 210 ; increases 

 power of adaptation, ii. 223 ; preliminary 

 stages of, ii. 213 ; not a rejuvenescence 

 in the sense of preserving life, ii. 221. 

 Ancestral plasm, ids of, ii. 38. 



Ants, several kinds of ids in the germ- 

 plasm of, 390 ; harmonious adaptation 

 of sterile forms, ii. 89; degeneration 

 of wings and ovaries in the workers, 

 ii. 90 ; transition forms between females 

 and workers, ii. 92 ; Wasmann's ex- 

 planation of these, ii. 93 ; Polyergus 

 rufescens, ii. 95 ; dimorphism of workers, 

 ii. 96 ; number of queens, ii. 98. 

 Apes, furred, in Tibet, ii. 269. 



Arctic animals, sympathetic colouring in, 



62. 

 Aristotle, 10. 

 Assimilation, ii. 371. 

 Auerbach, spindle-figure of the dividing 



cell-nucleus, 289. 

 Autotomj', self-amputation, ii. 18. 



Baer, K. E. von, development of the chick 

 in the egg, 25. 



Barfurth, on the segmentation of the egg 

 in the sea-urchin, 408. 



Bates, discovery of mimicry, gi ; on the 

 Sauba ant, ii. 96. 



Beccari, Amhhjornis inoniafa, 223. 



Bees, harmonious adaptation in the 

 workers, ii. 89 ; influence of nutrition 

 on the degeneration of the ovaries, ii. 

 92 ; importance of the fact that there 

 is only one queen, ii. 97. 



Belt, plants and ants, 171. 



Beneden, E. van, fertilization of the ovum 

 of Ascaris, 295 ; deutoplasm, 282 ; theory 

 of mitotic cell-division, 291. 



Bickford, Elizabeth, experiments on re- 

 generation, ii. 90. 



Binswanger, on artificial epilejisy in 

 guinea-pigs, ii. 68. 



Biogenetic Law, Fritz Miiller's view, ii. 

 160 ; crustacean larvae, ii. 161 ; 

 Haeckel's views, ii. 173 ; markings of the 

 caterpillars of the Sphingidee, ii. 177 ; 

 shunting back of the stages in the 

 ontogeny, ii. 177. 



Biophors, the smallest vital units, 369 ; 

 struggle of the, ii. 52 ; spontaneous 

 generation of, 369. 



Birds, adaptation in, ii. 315. 



Blochmann, on the directive corpuscles 

 in parthenogenetic ova, 304 ; on the 

 development of the ovum of the bee, 

 336 ; on chromosomes in unicellulars, 

 ii. 217. 



Blumenbach, ' nisus formativus,' 352 ; 

 inheritance of mutilations, ii. 66. 



Bois - Eeymond, doubts as to the in- 

 heritance of functional modifications, 

 242. 



Bonnet, preformation theory, 350, 351. 



Bordage, regeneration, ii. 20. 



Borgert, proof of the splitting of the 

 chromosomes in the division of uni- 

 cellulars, ii. 216. 



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