406 
the mnemonic 
316; the vital 
stimuli, 298; 
phenomenon, 
process, 337. 
Hertz; researches, 344, 345, 348. 
Heschenhagen ; capacity of 
adaptation in the lower fungi, 
173. 
Heteromorphosis, 87. 
Heteroplastic grafts, 9o. 
His; conception of development, 
248. 
Hoffman; inheritance of alter- 
ations, 172-3. 
Hofmeister; chemical develop- 
ment, 278. 
Horns, development of, 163. 
Hunger; inheritance of alter- 
ations, 172, 361; leads to sense 
of ownership, 387. 
Huxley; definition of plants, 43. 
Hyatt; shells of cephalopods, 
162. 
Hybrids, 99, 144. 
Hydra, 83, 86, 143, 362. 
Hypophysis, 11. 
Hyrtle; defective growth, 305. 
Idioblasts, 145. 
Idioplasm, 18, 83, 80, 132, 145, 
236, 230, 255, 316. 
Ids, (Weismann’s), 122. 
Ilyanassa obsoleta, 109. 
Immunisation, 234, 272. 
Independence of parts with ref- 
erence to whole, 376. 
Infusoria, regeneration in, 53. 
Inheritance of acquired char- 
acters, mechanism, 289. 
Instincts, 151, 161, 175, 177, 200, 
227, 313, 320. 
Index 
Intellect, an aid in transference 
and source of new affectivities, 
386 f. 
Intercellular bridges, 30ff, 309, 
40. 
Interpolation of ontogenetic 
stages, 96. 
Invagination, 48, 49, 258; Gas- 
trular double, 87. 
Invariability, environmental, 364; 
individual, 370; physiological, 
361, 363, 368; physiological, a 
factor in social evolution, 370 f; 
tendency to physiological, mre- 
monic, 373. 
Involution, 49, 191, 212, 221. 
Irritability, 298, 333. 
Irrito-contractility, 43. 
James; emotions, 391; choice, 
397; actual and ultimate cause, 
398. 
Jastrow; 
227. 
Jennings; reactions to food, 362; 
reactions to light and tempera- 
ture, 364; ameba, 369; organism 
works for an end, 398 f. 
Johnson, H. P., 284, 285. 
Jost; heteroplastic grafts, 90. 
Justice, origin of, 388. 
instinct in chickens, 
Kallima, 185. 
Karyokinesis, 354. 
Kastor; structure of bone, 129. 
King, Helen Dean, 60. 
Kohlwey, 171. 
Lactation, 379. 
Lamarckian principle, 159, 175, 
196, 202, 203, 207, 223, 224, 314, 
367. 
