INDEX OF SUBJECTS 



Crcpidula, fertilization, 157; position of 

 spindles, 277; dwarfs and giants, 289. 



Cross-furrow, 270. 



Crustacea, spermatozoa, 105, 106. 



Ctenophores^. experiments on eggs, 314. 



Cyclas, ciliated cells, 30. 



Cyclops, ova, 93 ; primordial germ-cells, 112; 

 fertilization, 142, 156, 218; reduction, 189- 

 191 ; attraction-sphere, 233; axial rela- 

 tions, 286. 



Cytolymph, 17. 



Cytoplasm, 15, 29, 213, 236; of the ovum, 

 97, 115, 170; of the spermatozoon, 107; 

 morphological relations to nucleus, 214; 

 to archoplasm, 230-235; chemical rela- 

 tions to nucleus, 238, 240, 241; physio- 

 logical relations to nucleus, 248; in 

 inheritance, 297, 298, 327; in develop- 

 ment, 315-320; origin, 327. 



Dendrobcena, metamerism, 291. 



Determinants, 183, 305. 



Deutoplasm, 90, 91, 94; deposit, 115; ar- 

 rangement, 117, 279; effect on cleavage, 

 273; re-arrangement by gravity, 285, 319. 



Development, I, 6; and cell-division, 264; 

 mosaic theory, 298; theory of Nageli, 301 ; 

 Roux-Weismann theory, 303; of single 

 blastomeres, 298, 307, 315; of egg-frag- 

 ments, 217, 258, 285, 315; Hertwig's 

 theory, 312, 317; Driesch's theory, 313, 

 317; partial, 315; half and whole, 319; 

 nature of, 320; external conditions, 323; 

 and metabolism, 326; unknown factor, 

 327; rhythm, 328; adaptive character, 



329- 



Diatoms, mitosis, 67; centrosome, 224. 

 Diemyctyhis, yolk, 116; yolk-nuclei, 119. 

 Differentiation, 264, 296; theory of De Vries, 



303; of Weismann, 305; nature and 



causes, 311-320; of the nuclear substance, 



321; and cell-division, 323. 

 Dispermy, 147, 260. 

 Double embryos, 308, 319. 

 Dwarfs, formation of, 258, 289, 307-309, 



315; size of cells, 289. 

 Dyads (Zweiergrappen), 179, 181, 184, 189; 



in parthenogenesis, 203-205. 

 Dyaster, 51. 



Dycyemids, centrosome, 36. 

 Dytiscus, ovarian eggs, 115, 256. 



Earthworm, ova, 115; spermatozoon, 125; 

 yolk-nucleus, 121 ; fertilization, 135; polar 

 rings, 150; spermatogenesis, 200; telo- 

 blasts, 274. 



Echinoderms, spermatozoa, 123; fertiliza- 

 tion, 143, 157; polyspermy, 147; dwarf 

 larvae, 258, 289; half cleavage, 306; eggs 

 under pressure, 309; modified larvae, 324. 



Echinus, fertilization, 143, 157; centrosome, 

 2 35; dwarf larvae, 258; number of cells, 

 291. 



Egg-axis, 278; promorphological signifi- 

 cance, 279, 298; determination, 285, 287, 

 322; alteration of, 319. 



Egg-centrosome, 91, 119; degeneration of, 

 91, 138, 141, 142, 171; asserted persist- 

 ence, 157-159. 



Egg-fragments, fertilization, 97, 145, 148; 

 development, 217, 258, 285, 289, 315. 



Elasmobranchs, spermatozoon, 100, 124; 

 germinal vesicle, 193, 245; reduction, 200. 



Embryo-sac, 1 60. 



Enchylema, 17. 



Endoplasm, 29. 



End-piece, 100, 104. 



End-plate, 64. 



Envelopes, of the egg, 96. 



Epigenesis, 6, 305, 327, 328. 



Equatorial plate, 49, 58, 66; formation, 74. 



Euchceta, tetrads, 190. 



Euglena, mitosis, 64. 



Euglypha, mitosis, 63, 277. 



Evolution (preformation), 6, 298, 305, 327, 

 328. _ 



Evolution, theory of, 3. 



Exoplasm, 29. 



Fertilization, general aspect, 7; physiologi- 

 cal meaning, 129; general sketch, 130; 

 Ascaris, 132; mouse, 136; sea-urchin, 

 138; Nereis, 141; Cyclops, 142; 77ia!as- 

 sema, Chcetopterus, 143; pathological, 148; 

 partial, 140,259; of Myzostoma, 159; in 

 plants, 1 60; egg-fragments, 97, 145, 258; 

 Boveri's theory, 141; general aspect, 171; 

 Minot's theory, 183; Maupas on, 165. 



Fishes, pigment-cells, 73; periblast-nuclei, 

 83; spermatozoa, 100; young ova, 116; 

 dwarfs, 309. 



Flagellates, diffused nuclei, 23. 



Follicle, of the egg, 113. 



For Jidda, nurse-cells, 115, 255. 



Fragmentation, 46. 



Fritillaria, spireme, 78. 



Frog, ganglion-cell, 1 6, 33; tetrads, 192; 

 egg-axis, 278; first cleavage-plane, 280, 

 282, 298; Roux's puncture experiment, 

 299; post-generation, 307; pressure-ex- 

 periments, 309; effect of gravity on the 

 egg, 285, 319; development of single 



