INDEX OF SUBJECTS 



479 



Contractility, theory of mitosis, lOO; inade- 

 quacy, io6. 



Copepods, reduction, 251. 



Corixa, ovum, 383. 



Corpuscule central, 310, 314. 



Crepidula, fertilization, 210; dwarfs and 

 giants, 389; cleavage, 323, 423. 



Cross-furrow, 368. 



Crustacea, spermatozoa, 142. 



Ctenophores, experiments on eggs, 418. 



Ciictirbita, 346. 



Cuticular, 54. 



Cyanophyceae, nucleus, 31, 39. 



Cycads, spermatozoids, 144, 173; fertiliza- 

 tion, 218, 221. 



Cyclops, o\2i, 128; primordial germ-cells, 148; 

 fertilization, 188; reiluction, 251; attrac- 

 tion-sphere, 325; axial relations, 385. 



Cytoplasm, 21, 41, 293, 303; of the ovum, 

 130; of the spermatozoon, 134; morpho- 

 logical relations to nucleus, 302; to archo- 

 plasm, 316, 319; chemical relations to 

 nucleus, 333-341; physiological relations 

 to nucleus, 341; in inheritance, 352-354, 

 359; in development, 398, 421 ; origin, 431. 



Cytosome, 322. 



DendrobcEna, metamerism, 390. 



Determinants, 245. 



Deutoplasm, 131 ; deposit, 153; effect on 

 cleavage, 366, 371; rearrangement by 

 gravity, 422. 



Development, 1-12; and cell-division, 388; 

 mosaic theory, 399, 421 ; theory of Nageli, 

 402; Roux-Weismann theory, 404; of 

 single blastomeres, 399, 409, 418; of egg- 

 fragments, 296, 353, 419; De Vries's the- 

 ory, 413; Hertwig's theory, 415, 432; 

 Driesch's theory, 394, 415; partial, 409, 

 419; half and whole, 419; nature of,4i3; 

 external conditions, 428; and metabolism, 

 430; unknown factor, 431 ; rhythm, 432; 

 adaptive character, 433. 



Diapiomus, 250. 



Diatoms, mitosis, 92; centrosome, 51. 



Diaulula, 79, 314. 



Diemyctylus, yolk, 153; yolk-nuclei, 156. 



Difterentiation, 361 ; theory of De Vries, 

 404; of Weismann, 405; nature and 

 causes, 413; of the nuclear substance, 

 425; and cell-division, 427. 



Dipsacus, 346. 



Dispermy, 355. 



Double embryos, 410, 422. 



Drosera, 350. 



Dwarfs, formation of, 353, 410, 422; size of 

 cells, 389. 



Dyads (Zweiergruppen), 239, 241 ; in par- 

 thenogenesis, 284. 



Dyaster, 70. 



Dycyemids, centrosome, 51. 



Dytisciis, ovarian eggs, 153, 349. 



Earthworm, ova, 152; spermatozoon, 165; 

 yolk-nucleus, 154; polar rings, 156, 202; 

 spermatogenesis, 257; teloblasts, 374. 



Echinoderms, protoplasm, 28, 44, 293; sper- 

 matozoa, 137; fertilization, 188, 212; 

 polyspermy, 194, 198; dwarf larv;e, 353, 

 410; half cleavage, 410: eggs under press- 

 ure, 411; modified larvae, 428. 



Echinus, fertilization, 210; centrosome, 314; 

 dwarf larvie, 353; number of cells, 389. 



Ectosphere, 324. 



Egg-axis, 378; promorphological signifi-' 

 cance, 379; determination, 386; alteration 

 of, 422. 



Egg-fragments, fertilization, 194; develop- 

 ment, 352. 



Elasmobranchs, spermatozoon, 140, 167, 169; 

 germinal vesicle, 245, 273; reduction, 257. 



Embryo-sac, 218, 263. 



Enchylema, 23. 



End-knob, 136. 



Endoplasm, 41. 



End-piece, 140. 



End-plate, 91. 



Energid, 19, 30. 



Entosphere, 324. 



Envelopes, of the egg, 132. 



Epigenesis, 8, 432. 



Equatorial plate, 68. 



Equisetuni, mitosis, 85. 



Ergastoplasm, 322. 



Erysiphe, mitosis, 82. 



Euclueta, tetrarls, 250. 



Euglena, mitosis, 91, 315, 



Englypka, mitosis, 89, 95. 



Evolution (preformation), 8, 399, 432, 



Evolution, theory of, 2, 8. 



Exoplasm, 41. 



Fertilization, general aspect, 9; physiologi- 

 cal meaning, i8o; general sketch, 180; 

 Ascaris, 182; mouse, 185; sea-urchin, 188; 

 Nereis, 188; Cyclops, 188; Tlialassema, 

 Chatopterus, 193, 195; pathological, 198; 

 partial, 190, 194; of A/ysos/of/ia, ig6, 208; 

 in plants, 215; egg-fragments, 194; Bo- 

 veri's theory, 192, 211. 



