Index 
Germinal tracks, “Keimbahnen,” 
283. 
Germinal zone, 74. 
Germs, Galton’s, 145. 
Germs, preformistic (see prefor- 
mistic germs.) 
Germ cells, 83, 84, 189, 228-231, 
252, 254, 257, 258. 
Giard; parasitic relation of off- 
spring to parent, 378; brood- 
ing, 379; lactation, 380; ma- 
ternal affection, 381. 
Giraffe, 198. 
Goethe, nature of flowers, 72. 
Goldstein, Kurt; influence of the 
central nervous system on de- 
velopment, 76. 
Gorilla, 13. 
Graf, leech, 125. 
Grafts, 80, 90, 117. 
Gregariousness caused by habit, 
383. 
Gromia oviformis, 42. 
Gros (see Durand de Gros). 
Gruber; division of infusoria, 
54, 58; stentor coeruleus, 54, 
55; unicellular and_ pluricel- 
lular organisms, 60. 
Guinea pig, inheritance of the 
effects of injuries in, 166. 
Haacke; theory of inheritance, 
228. 
Haase, H.; regeneration in Tubi- 
fex rivulorum, 140. 
Habit, origin of affective tenden- 
cies, 378; influence of, 384. 
Haeckel; perigenesis, 259; his 
theory, 250, 314; mnemonic 
character of plastidules, 316. 
Haeckel’s biogenetic law (see 
biogenetic law). 
405 
Hammar; communications be- 
tween the cleavage cells of the 
sea urchin egg, 39. 
Hansemann; nuclear 
355: 
“Harmonicity” of Vochting, 89. 
Hartmann, Eduard von; doctrine 
of descent, 196. 
Hartog, Marcus, 353. 
Heidenhain; intercellular bridges 
between cells of different tis- 
sues, 40. 
Helleborus niger, 247. 
Hemitherium anterius, 63. 
Hensen; memory, 324. 
Herbst; sea urchin, 80; epigen- 
etic theory, 246. 
Hering; the phenomenon of 
memory, 316 ff; the nervous 
“substance as the preserver of 
memories, 321, 375. 
Heritage (all that is inherited), 
77, 85, 237, 249, 274, 275. 
Hermaphroditism, 366. 
Hermit crabs, 181. 
Hertwig, Oscar; embryonal 
organs without function, 12; 
transmission of the stimulus 
for membrane formation, 32; 
transmission of nuclear stim- 
uli, 42; gastrular invagin- 
ation, 75, 87; frogs’ eggs, 80; 
shifting the blastomeres, 81; 
hereditarily equal division, 81, 
82; double gastrular invagina- 
tion, 87; organization of the 
egg, 97; causes of the specifi- 
city of development, 106; galls, 
124; new formations, 136; bi- 
ogenetic theory, 233 ff; rejec- 
tion of biogenetic law of 
Haeckel, 242; specific action of 
division, 
