INDEX OF SUBJECTS 



479 



Contractility, theory of mitosis, loo; inade- 

 quacy, 1 06. 



Copepods, reduction, 251. 



Corixa^ ovum, 383, 



Corpuscule central, 310, 314. 



Crepichda, fertilization, 210 ; dwarfs and 

 giants, 389; cleavage, 323, 423. 



Cross-furrow, 368. 



Crustacea, spermatozoa, 142. 



Ctenophores, experiments on eggs, 41 S. 



Cucurbita, 346. 



Cuticular, 54. 



Cyanophyceae, nucleus, 31, 39. 



Cycads, spermatozoids, 144, 173; fertiliza- 

 tion, 218, 221. 



Cyclops, 0x^,12"^', primordial germ-cells, 148; 

 fertilization, 188; reduction, 25 1; 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, 42 1 ; origin, 431. 



Cytosome, 322. 



Dendrobczna, 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; Hert wig's theory, 415, 432; 

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

 419; half and whole, 419; nature of, 413; 

 external conditions, 428; and metabolism, 

 430; unknown factor, 431 ; rhythm, 432; 

 adaptive character, 433, 

 Diaptomus, 250. 



Diatoms, mitosis, 92; centrosome, 51. 

 Dinnlula, 79, 314. 



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

 Differentiation, 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. 4,0, 422: size of 

 cells, 389. 



Dyads (Zwciergruppen;, 239, 241 ; in par- 

 thenogenesis, 284. 

 Dyaster, 70. 



Dycyemids, centrosome, 51. 

 Dytiscus, ovarian eggs, 153. :}4q. 



Earthworm, ova, 152; spermatozoon. 165; 

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

 spermatogenesis, 257; tclublasts, 374. 



Echinoderms, protoplasm, 28. 44, 29 1; sper- 

 matozoa, 137; fertilization, 188. 212; 

 polyspermy, 194, 198; dwarf larva-, 353, 

 410; half cleavage, 410: eggs under press- 

 ure, 41 1 ; modified larva.*, 428. 



Echinus, fertilization, 210; centrosome, 314; 

 dwarf larv.-e. 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. 

 Ei/uist'ium, mit«)sis, 85. 

 Ergastoplasm, 322. 

 Erysiphe, mitosis, '8>2. 

 Eiiclucta, tetrads, 2^0. 

 EugUna, mitosis, 91, 31;;. 

 Euglypha, mitosis, 89, 95. 

 Evolution (preformation), S, 399, 452. 

 Evolution, theory of, 2, 8. 

 Exoplasm, 41. 



Fertilization, general aspect. 9: physiologi- 

 cal meaning, iSo; general sketch, iSo; 

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

 Nereis, 188; Cychps, '188: 7'haiassema, 

 Cfuctoptertts, 193. 195; pathological, 198; 

 partial, kk). 194; of J/ico^/c^w./. 196, 20S; 

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

 veri's theory, 192, 211. 



