INDEX 



399 



manteau theory,' ii. 3 ; experimpnts 



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. 

 Dimorpliism, 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 dift'erential nuclear 



division {Phylloxera), sti ; 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, discoveiy of parthenogenesis 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. 

 Elymnias, a genus of mimetic butterflies, 



103. 

 Emery, on extinction of species, ii. 357 ; 



on Colohopsis truncata, 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, phyletic, 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 



diversityofformsoflife, ii. 391 ; parable 



of the traveller, ii. 386. 



Evolution theory, general meaning of, 6; 



' prospective ' import of the cell, 378. 

 Exner, electric adaptation of the fur of 



mammals and feathers of birds, 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 Aacaris, 296 ; in the sea-urchin 

 ovum, 293 ; in Phanerogams, 313 ; in 

 higher plants, ii. 251 ; importance of the 

 chromatin, 290; conjugation, 317; the 

 centrosphere the dividing apparatus of 

 the cell, 289 ; chromatin the hereditary 

 substance, 287 ; differentiation of in- 

 dividuals among the Protozoa, 322 ; 

 number of chromosomes reduced to half, 

 297 ; njle of the centrosphere, 308 ; 

 summary of process of fertilization, 343. 



Fischel, segmentation of the Ctenophore 

 ovum. 408 ; regeneration of the lens in 

 Triton, ii. 20. 



Fischer, E., experiments with butterfly 

 pupiie in low teniperature, ii. 275. 



Flowers, origin of, 179 ; adaptation to 

 insects, 189 ; in Arixtolochia, Pinguicula, 

 and Baplini; 186 ; colour as an attx'ac- 

 tion to insects. 195 ; collecting apparatus 

 of bee, 193; cross-fertilization, means for 

 securing, 182 ; in Salvia, 183 ; lousewort, 

 184 ; flowers adapted to fly-visits, 185 ; 

 orchids, 187 ; deceptive flowers, Ctjpri- 

 pediinn, 200 ; fertilization of Yucca, 202 ; 

 imperfection of adaptation a proof of 

 origin through selection, 204 ; mouth- 

 parts of insects. i8g ; bee, 172; butter- 

 fly, 193 ; cockroach, 191 ; wind-polli- 

 nation. 182. 



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



83. 



Fraisse, on regeneration, ii. 30. 



Function, passively functioning parts in 

 relation to the lamarckian principle, 

 ii. 77 ; harmonious adaptation in these, 

 ii. 81. 



Fungi, reproduction of, ii. 267. 



Fur of mammals, adaptation to the con- 

 ditions of life, ii. 269. 



Galapagos Islands, fauna ot^ ii. 283, 292. 



Galileo, Galilei, 13. 



Galls, plant, 385 ; ii. 271. 



Gall-wasps, reproduction of, ii. 245. 



Galton, Francis, on continuity of the 

 germ-plasm, 411 ; on inheritance of 

 talents, ii. 150 ; curves of frequency, 

 ii. 206 ; doubt of the Lamarckian prin- 

 ciple, 242. 



Genius, human, ii. 394. 



Germ - cells, and somatic cells, 411; 

 development of, 410 ; tlieir mutual 

 attraction, ii. 230. 



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