412 
Subjectivity of affective tenden- 
cies, 377. 
Substitution of part for whole, 
363, 368, 376, 385. 
Succession of ontogenetic stages, 
15, 246, 330. 
Symmetrical planes, 69, 115. 
Syncytium, 39, 230. 
Synergids, Sach’s, 41. 
Synthesis vital, 340. 
Tadpole, disappearance of tail, 
49; amputated tails of, 116, 
307; grafts, 128. 
Telephone, 301. 
Teratogenesis, 126. 
Terns, stomachs of, 125. 
Thermal energy, 348. 
Thirst, 363. 
Tornier; theory of inheritance, 
232. 
Transference, 385 ff. 
Transplantation of tissues, 90, 
122. 
Triton, regeneration of the lens 
of the eye of, 28, 89, 140; ar- 
rest of development of, 99. 
Trophic stimulus, 37, 49. 
Unicellular organisms like pluri- 
cellular, 59. 
Variations, coordinated, see Co- 
ordinated variations; sponta- 
neous, 144; plus and minus, 
I9I. 
Vegetative affinity, 92. 
Velleius dilatatus, 200. 
Verworn; physiologic — signifi- 
cance of the cell nucleus, 54 
note, 57 note; biogen-hypo- 
thesis, 335. 
index 
Vis a fronte, 308 f. 
Vis a tergo, 398 f. 400. 
Vital energy, 336. 
Vital induction, Bard, 231. 
Vital phenomenon, geieral, 299, 
315, 318, 319, 322 ff, 332, 343, 
348, 350, 357. 
Vital principle, search for the 
nature of, 335. 
Vital processes, identical, 43. 
Vitis aestivalis, 156. 
Vochting; “harmonicity,” 80. 
Volvox, cell communications, 30. 
Vulpian; continued life in am- 
putated tails, 116. 
Watasé; centrosomes, 355. 
Weber, E. H.; effects of absence 
of the spinal cord, 305. 
Weismann; inactivity of the germ 
plasm, 17; chromatin, 82; an- 
tagonism between germinal and 
somatic nuclei, 84, 85; pre- 
formation proper, 106, 121; in- 
admissibility of determinants 
of, 125; principle of the ca- 
pacity of alteration, 127; rigid- 
ity of the determinants, 131; 
post generation, 134; new 
formations in regeneration, 
137; regeneration, 139; ceno- 
genetic regeneration, 142; 
grouping of determinants, 143; 
preformation, 147; pangens, 
152; intermingling of paternal 
and maternal characters, 154; 
doubt of the inheritance of ac- 
quired characters, 159; Punjabi, 
164; opposed to Brown Sé- 
quard, 168; non-inheritance of 
the effects of amputations, 170; 
arguments against the inherit- 
