INDEX 



371 



75, 223; monsters (cyclopean) in 

 presence of lithium, 318, 319; 

 ovum, 94 



Gametes, of Metazoa, 13; of Pro- 

 tozoa, 189, ff. 



gametogenesis, 18 



gametogonidia, 10 



gametophvte, chromosomes of, 161- 

 162 



Ganoids, blastula, 331 



Garbowsky, 283 



gastrula, 19, 333, ff. 



gastrulation, 333, ff.; in meroblastic 

 ova, 343, ff. 



Gegenbaur, 20 



gemraules, 7 



genetic continuity, of cell organs, 

 55 ; of chromosomes, 70, ff. 



genital ridge, 109 



germ, 14; organization of, 23, 25; 

 predetermination of, 264, ff. 



germ cells, 85, ff.; derivation of, 112- 

 113; of Protozoa, 189, ff.; relation 

 to breeding habits, 102, ff. 



germ disc, 177, 332 



germinal continuity, theory of, 14, 

 15 



germinal localization, hypothesis, 

 264, ff. 



germinal vesicle, 89 



germ layers, in budding, 358; in 

 regeneration, 358; morphogenetic 

 value of, 356, 358; primary, 334; 

 theory of, 355, ff.; ex- 

 ceptions to, 357, ff. 



germ ring, 348; of Amphioxus, 334; 

 of frog, 340, 343 



"giant" polar bodies, 148, 149 



Godlewski, 171, 220, 221, 301, 304 



Gonactinia, fission, 5 



gonads, 109; epithelial structure, 

 112; of Metazoa, 13 



growth period, of 06- and spermato- 

 cyte, 113 



guinea pig, metamorphosis of sper- 

 matid, 126 



Gulick, 311 



Guyer, 311, 313 



Hacker, 135 



Haeckel, 280 



Hagedoorn, 301 



Haller, 22 



haploid number of chromosomes, 



130, 133 



Hartmann and Xagler, 160 

 Harvey, 202 



head, of spermatozoon, 98 

 Heidenhain, 41, 80 

 Helix, chromosomal variation, 67; 



"trophospongien" in hepatic duct 

 cells, 40 



Henking, 307, 310 



Herbst, 75, 271, 298, 303, 318 



heredity, defined, 261; mechanism 

 of, 321-322; relation to develop- 

 ment, 260, ff.; fertiliza- 

 tion, 214, ff.; role of external 

 factors in, 317, ff. 



hermaphroditism, 13 



Hertwig, O., 56, 114, 150, 213, 263, 

 265, 281 



Hertwig, O. and R., 356 



Hertwig, R., 77, 157, 209, 210, 222 



Hesperotettix, X-chromosome, 312 



heterochromosomes, 310 



Heterodontus, ovum, 87 



heterotype division, 140 



His, 264, 352 



histogenesis, 20, 363 



Holophrya, multiple fission, 3 



homolecithal ova, 93, 226 



homotvpe division, 141 



Hooke, 31 



human ovum, 88 ; spermatozoon, 

 98, 100 



Huxley, 223 



hyaloplasm, 35 



hybridization, evidence from, upon 

 chromosome hypothesis, 301, ff. 



Hydatina, relation of sex to fertiliza- 

 tion, 315 



Hydra, ovum, 88, 118 



Hydrophilus, superficial cleavage, 

 243 



hypoblast, 334 



Ids, idants, 292 

 idiochromatin, 58, 158 

 idiochromidia, 41, 156, 190 

 idiochromosomes, 307; variations 



in, 311, 312, 313 

 idiosome, 125 

 Inachus, spermatozoon, 99 

 indirect cell division, 44, ff. 

 Insects, maturation, 140 ; ovaries 

 , (egg tubes), 117, 118 

 interfilar substance, 35 

 interkinesis, 45 

 intermediate layer, 333 

 internal buds, 7 

 interzonal fibers, 53 

 invagination, 336, 360 

 involution, 336 

 islands, protoplasmic, 242 

 isogamy, 192, ff. 

 isolated blastomeres, development 



of, 269, ff., 280, ff. 

 isolecithal ova, 93, 226 

 isotropic blastomere group, 263 



