Index 413 
ance of acquired characters, 
177 ff; action of external stim- 
uli on development, 183 note; 
panmixia, 184; alterations in 
plants, 186; polemic with 
Spencer, 187, 211; inconceiv- 
ability of the inheritance of ac- 
quired characters, 188; pan- 
mixia, 190 ff; almightiness of 
natural selection, 193, 210, 367; 
taste sense in the tongue papil- 
lae, 194; amphimixis, 1094 ff; 
stability of many species, 196; 
functional adaptation, 197, 204; 
similar characters of different 
species, 205; coordinated vari- 
ations, 214; determinants of 
lesser or greater power of 
growth, 212, 221; biogenetic 
law, 220; inability of his theory 
to explain the biogenetic law, 
222; opposing Nageli, 242, 243; 
Polyommatus phlaeas, 284; in- 
heritance in unicellular organ- 
isms, 284. 
Whitman, 2; the same vital ele- 
ments in Infusoria and in 
higher animals, 60; evolution, 
105; cell formation, 136. 
Wilckens; development of horns, 
163. 
Will, and impulse, 392; free, sub- 
jective illusion of, 394; act of, 
397. 
Wilson, E. B.; Amphioxus, 80, 
133; cell lineage in Nereis, 110 
note; color designs in the ani- 
mal body, 125; egg of Amphi- 
oxus, 133; particulate inherit- 
ance and the pangenetic theory, 
144. 
Wireless telegraphy, 345. 
Wolff, G.; physiologic basis of 
the theory of signs of degen- 
eration, 76. 
Wolff, J.; structure of bone, 126. 
Wundt; the nervous process con- 
cerned in perception and mem- 
ory, 325. 
Xenia, 74. 
Zahn; transplantation of tissues, 
123. 
Zebra, stripes of the, 152. 
Ziegler; researches upon cell di- 
vision, 355. 
Zoe, regeneration in, 140. 
Zoja, Raffaelo; Medusa, 80. 
Zoospores, phenomena of nervous 
nature in, 30. 
