406 



Index 



stimuli, 298; the mnemonic 

 phenomenon, 316; the vital 

 process, 337. 



Hertz; researches, 344, 345, 348. 



Heschenhagen ; capacity of 

 adaptation in the lower fungi, 

 173- 



Heteromorphosis, 87. 



Heteroplastic grafts, 90. 



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, n. 



Hyrtle; defective growth, 305. 



Idioblasts, 145. 



Idioplasm, 18, 83, 89, 132, 145. 

 236, 239, 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- 



Intellect, an aid in transference 

 and source of new affectivities, 

 386 f. 



Intercellular bridges, 30 ff, 39, 

 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, mne- 

 monic, 373. 



Involution, 49, 191, 212, 221. 



Irritability, 298, 333. 



Irrito-contractility, 43. 



James ; emotions, 391 ; choice, 

 397; actual and ultimate cause, 

 398. 



Jastrow; instinct in chickens, 

 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. 



Kallima, 185. 



Karyokinesis, 354. 



Kastor ; structure of bone, 126. 



King, Helen Dean, 60. 



Kohlwey, 171. 



Lactation, 379. 



Lamarckian principle, 159, I75> 



196, 202, 203, 207, 223, 224, 314, 



367. 



