INDEX OF SUBJECTS 



Fertilizability of egg of Nereis, i86 



of Platynereis, 189 

 Fertilizability, seat of, in eggs, 191 

 Fertilizable condition of eggs, 186 

 Fertilization, as chemical reaction, 203 



Boveri's theory of, 182 



classes of eggs in, 153 



inhibition of, 196 



phases of. 179, 231 



phenomena common to, 177 



specificity in, 197-198 



straight, 21 



superficial cytolysis — corrective 

 factory theory of, 23c 

 Fertilization-cone, 159 ff., 178 

 Fertilizin, 195-197 

 Filaments, ectoplasmic, 79, 80, 85, 



102, 105, 145, 277-280 

 Filar theory of cytoplasmic structure, 



63 

 Fixation, 16 



of cells, 65-67 

 Flatworms, ectoplasm in eggs of, 92 



Gastrula, 213, 300 



Gastrulation, 193, 301 



Gene, 7 



role of, in heredity and differentia- 

 tion, 326 



Gene-molecule, 6—7, 323 



Genes, linear arrangement of, 322 



Gene-theory of heredity, 7, 325 



Genetic restriction, 313, 320 



Genetics, 8, 321 



Germ cells, 147, 249, 316 



Germinal vesicle, 131, 153, 316 



Golgi bodies, 55 



Gradient, axial, 301 



Granular theory of cytoplasmic struc- 

 ture, 63-64 



Ground-substance, 37, 57-58, 64, 67, 



365 



dehydration of, 245 



in nucleus, 70 



radiating structures in, 68-70 



structure of. 64 

 Growth, 248 

 Gyrodactylus, egg of, 153 



H 



Haemolytic agents, 227, 232 

 Heat-liberation of eggs, 115 

 Heat-production in eggs, 1 14-11 5 

 Hermaphroditism, 155, 156, 329 



in starfish, 213 

 Hetero-agglutination of spermatozoa, 



197 

 Heteronereis phase, 186 

 Hormones, integration by, 122 

 Hyaline plasma-layer in sea-urchin 

 eggs, 95-96, 107, 171, 257, 

 277 

 Hydration and dehydration, of yolk- 

 spheres, 135 

 role of lipoid in, 135 

 Hydrogen-ion concentration, effect of 



changes in, on eggs, 340 

 Hyd-rophilus, egg of, 301 

 Hypotonic sea-water, changes of eggs 

 in, 130 

 development of eggs in, 130 

 means for experimental parthe* 



nogenesis, 129 

 susceptibility of eggs to, 108- 



113 



Hypotonicity, limits of, 127-129 



I 



Independent irritability, 237 



Indicia, physiological, for normality, 



23 



Individuality of the chromosomes, 

 322-324 



Inhibition of fertilization by body- 

 fluid, 198 



Initiation of development in eggs, 206- 

 207 



Insects, ectoplasm in eggs of, 98 



Integration of cells, 121-123, 363 



Intercellular connections, JJ, 120, 335 

 fibres, 7J, 78 



Invagination, 193, 301 



Isolated blastomeres, 318 



K 



Kropotkin theor}-, 367 



3S8 



