INDEX 



399 



manteau theory,' ii. 3 ; experiments 



with sea-urchins. 342. 

 Desert animals, sympathetic colouring in, 



62. 

 Determinants, active and passive state, 



380; controlling the cells, 381 ; proofs of 



their existence, 361, 371, 408 ; in limbs 



of Arthropods, 361 ; liberation of, 382 ; 



size and number, 369. 

 Determinates, 355. 

 Deutoplasm, 280. 

 Dewitz, degeneration of wings in the 



ontogeny of worker-ants, ii. 90. 

 Diatoms, ii. 324. 

 Dimorphism, sexual, its idioplasmatic 



cause, 388. 

 Disappearance of disused parts, ii. 135 ; 



unequal rate of, ii. 129. 

 Dividing apparatus of the ovum, 288, 308. 

 Division, proof of differential nuclear 



division {Phylloxera), 377 ; multiplication 



by division, ii. i. 

 Dixon, isolation as a condition of species 



formation, ii. 284. 

 Doderlein, increase of characters in dilu- 

 vial forms, ii. 139. 

 Dog, breeds of, 31 ; attachment to man, 



ii- 73. 

 Driesch, 'prospective' importance of a cell, 



378, 408. 



Dzierzon, discovery of jjarthenogenesis in 



bees, 303. 



Echinoderms, mesoderm cells of, 386, 387. 



Ectocarpus, 334. 



Egg-cell, form and structure, 280 ; its 



migrations, 281. 

 Ehrlich, experiments with ricin and abrin, 



ii. 106. 

 Eigenmann, on blind cave-salamanders, 



ii. 347 ; on species of Leptocephalus, ii. 



133- 

 Eisig, on symbiosis, 162. 



Elimination, ratio of, 47. 



Ehjnmias, a genus of mimetic butterflies, 



103. 

 Emery, on extinction of species, ii. 357 ; 



on Colohopsis trimcata, ii. 96 ; on germinal 



selection, ii. 139 ; ' mixed ' forms in 



ants, ii. 93 ; variation of homologous 



parts, ii. 189. 

 Empedocles, 9 ; ii. 370, 378. 

 Endemic species, ii. 283. 

 Endres, 'prospective' significance of the 



blastomeres of the ovum of the frog, 407. 

 Epigenesis and evolution. 350. 

 Epilepsy, artificial, in guinea-pigs. ii. 67. 

 Equilibrium between species of a region. 



49. 

 Evolution, fphyletic, ii. 332 ; paths of, 



ii. 381 ; forces of, ii. 381 ; mechanism 



of, 353 ; facts of, 406. 

 Evolution, progressive, attempt of species 



to extend its range, ii. 383 ; unlimited 



diversity of forms of life. ii. 391 ; parable 



of the traveller, ii. 386. 



Evolution theory, general meaning of, 6; 



' prospective ' import of the cell, 378. 

 Exner, electric adaptation <>f the fur of 



mammals and feathers of )>irds, ii. 316 ; 



vision of insects. 216. 

 Eye-spots, 69; ii. 179. 



Falkland Islands, influence of climate on 

 cattle and horses, ii. 268. 



Feathers, regarded as an adaptation, ii. 

 316. 



Fertilization, process of, 286 ; in lichens. 

 313 ; in Ascaris. 296 ; in the sea-urchin 

 ovum, 293; in Piianerogams, 313; in 

 higher plants, ii. 251 ; importance of the 

 chromatin, 290; conjugation, 317; tin' 

 centrosphere the dividing apparatus of 

 the cell, 289 ; chromatin the bereditary 

 substance, 287 ; differentiation of in- 

 dividuals among the Protozoa, 322 ; 

 number of cbromosomes reduced to half, 



' 297 ; role of the centrosphere. 308 ; 

 summary of process of fertilization, 343. 



Fischel, segmentation fpf the Ctcnophore 

 ovum, 408 ; regeneratif>n of the lens in 

 Triton, ii. 20. 



Fischer, E., experiments with butterfly 

 pupae in low temperature, ii. 275. 



Flowers, origin of, 179 ; adaptation to 

 insects, 189 ; in Aristohchla, rimjuicuhi. 

 and Daphne, 186 ; colour as an attrac- 

 tion to insects. 195 ; collecting apparatus 

 of bee, 193 ; cross-fertilization, means for 

 securing, 182; \\\ Salvia, 183; lousewort, 

 184 ; flowers adapted to fly- visits, 185 ; 

 orchids, 187 ; deceptive flowers. Cypri- 

 pedium, 200 ; fertilization of Yucca, 202 ; 

 imperfection of adaptation a proof of 

 origin through selection, 204 ; mouth- 

 parts of insects. 189; bee. 172; butter- 

 fly, 193 ; cockroach. 19T ; wind-polli- 

 nation, 182. 



Forel, Auguste, alarm-signals in ants, ii. 



83. 



Fraisse, on regeneration, li. 30, 



Function, passively functionijig parts in 

 relation to the Lamarckian principle, 

 ii. 77 ; harmonious adai)tation in these, 

 ii. 81. 



Fungi, reproduction of, ii. 267. 



Fur of mammals, adaptation to the con- 

 ditions of life. ii. 269. 



Galapagos Islands, fauna of; ii. 283, 292. 



Galileo, Galilei. 13. 



Galls, plant. 385 ; ii. 271. 



Gall- wasps, repi-oduction of, ii. 245. 



Galton, Fran«-is, on continuity of the 

 germ-plasm, 411 ; on inheritance of 

 talents, ii. 150; .urves of frequency, 

 ii. 206 ; doubt of the Lamarckian prin- 

 ciple, 242. 



Genius, human, ii. 394- 



Germ -cells, and somatic cells, 411; 



j^ development of, 410; tluir mutual 

 attraction, ii. 230. 



