368 



INDEX 



Bigelow, 230 



Bilharzia, in' copula, 106 



Biogenetic Law, 25, ff. 



biophores, 292 



Birds, gastrula and gastrulation, 

 345, 349 



blastoccel, 221, 331 



blastoderm, 241, 332 



blastodisc, 240, 332 



blastomeres, homologies, 256, 257; 

 isolated, development of, 269, ff., 

 280, ff.; nomenclature, 248, ff. 



blastopore, 334 



blastula, 19, 221, 330; types, 220, 

 221 



Bodo, conjugation, 196 



Bonnet, 22 



Boring, 311 



Born, 281 



Boveri, 70, 74, 81, 137, 300, 301, 305, 

 311 



Brachystola, chromosomal individu- 

 ality in spermatogonium, 73; 

 chromosomes, 68, 73 



Brauer, 158 



breeding habits, 102, ff. 



bridges, intercellular, 32, 42 



brood cavities, 104 



brood formation, 3; in Mycetozoa, 

 etc., 190 



budding, 6 



bud-fission, 7 



Buller, 166, 167 



Butschli, 81, 209 



Bythotrephes, spermazotoon, 108 



Calcium, effect upon blastomeres, 

 318-319 



calcium-free sea water, effects upon 

 cleavage stages, 271-272 



Calkins, 191, 210; and Cull, 



64, 157, 296 



Canthocamptus, intranuclear spindle, 

 67 ; oogenesis, 116 



Cavia, metamorphosis of spermatid, 

 126 



cell, continuity, 42; definition, 31; 

 diagram of, 35; displacement, in 



cleavage, 231 ; division, 43, ff.; 



causes of, 76, ff.; - - indirect, 

 44, ff.; - - mechanism, 79, ff.; 

 plane, 55, 56 ; forms, 32, 33 ; 

 general account, 31, ff.; interaction 

 hypothesis, 263-264; lineage, 247; 

 migration, in morphogenesis, 361; 

 multiplication, in 06- and sper- 

 matogenesis, 113, 114; polarity, 

 41; proliferation, in morphogene- 

 sis, 360; structure, 34, ff.; Theory, 

 in Embryology, 20; wall, 34 



central body, 61 



centrifugal force, effects upon egg 

 structure, 275, ff. 



centrolecithal ova, 94, 226 



centronucleus, 61 



Centropyxis, nuclear division, 60 



centrosome, 38, ff.; "artificial," 183, 

 207; continuity, during fertiliza- 

 tion, 181, 183; formation by 

 spermatozoon, 181; in Protozoa, 

 60, ff.; origin, in Protozoa, 60-62 



centrosphere, 39, 125 



Ceratocephale, spawning season, 103 

 . Cercomonas, conjugation, 193 



Cerebratulus, cleavage, 236 ; develop- 

 ment of isolated blastomeres, 287 ; 

 fertilization, 184 ; maturation of 

 ovum, 143 ; organization of ovum, 

 development of, 287 



Cerfontaine, 333 



Chcetopterus, differentiation without 

 cleavage, 279, 279; organization 

 of ground substance of ovum, 278; 



ovum, 268 ; polarity of 



ovum, 275; structure of ovum 

 following fertilization, 268 



chemicals, effects of, upon differen- 

 tiation, 318, ff. 



Chilomonas, cell division, 59, 64 



Chimcera, egg case, 109 



Chlamydomonas, conjugation, 193, 

 194; gametes, 198 



Chlamydophrys, nuclear division, 61 



chondriosomes, 41 



"chondromiten," 41 



chordaplasm, 267 



chorion, 96, 120 



chromatin, 38; elimination, 65; ex- 

 trusion, 45; possible signifi- 

 cance, 298; granules, 293, 294; 

 nucleoli, 38; reservoir, 71 



chromidia, 41, 156 



chromioles, 38; in reduction, 153 



chromosomes, 49-51; accessory, 310; 

 as determiners in differentiation, 

 289, ff.; as factors in heredity, 291, 

 ff.; behavior, as related to Men- 

 delian heredity, 294, 295; - 

 during cleavage, 223, 224 ; - 



maturation and fertilization, 



diagram, 154 ; mitosis, 

 63, ff.; bivalent, 67, 135; changes 

 in volume (growth), 69; con- 

 stancy of form and size, 67, 68; 

 during interkinesis, 64, 70, 72; 

 evolution, 296; genetic continuity, 

 70, ff.; heterotropic, 310; "hy- 

 pothesis," 293, ff.; individuality, 

 70; in heredity, 322; in Protozoa, 

 59, 60, 64; numbers, 66; in 



