INDEX 



441 



heredity, mnemic theory, 186 191, 



192. 



,, nature of problem, 163. 

 ,, Pearson on, 210. 

 ,, Weismann's theory, 166 



174. 



Hering, E., 186. 



hermaphrodite, 103, 105, 113, 114. 

 hermaphroditism, 93, 116, 125, 402. 

 heterogeny, 144. 

 Heteroinita, life-history, 85 87, 



Fig. 38. 



heterosporous ferns, 105. 

 heterostyled flowers, 356, Fig. 180. 

 heterozygote, 207. 

 hexadactylism, 154, 413. 

 Hilgard, E. W., 178. 

 Hipparion, 311. 

 Hippocampus antiquorum, 341, Fig. 



173. 



Hippopotamus, feet, 241, Fig. 98. 

 histological differentiation, 48. 

 histology, 51. 

 His, Wilhelm, 178. 

 hock, of horse, 240, Fig. 95. 

 holophytic nutrition, 34. 

 holozoic nutrition, 34. 

 Homo heidelbergensis, 423. 

 Homo, species of, 423. 

 homologous chromosomes, 137, 206, 



207. 



homology, 235, 247. 

 homoplasy, 235, 247. 

 homosporous ferns, 106. 

 homozygote, 207. 

 honey guide, 362. 

 honey sucking apparatus, 354. 

 Hooke, Kobert, 36. 

 Hooker, J. D., 385. 

 hormones, 126, 188, 408. 

 hornbill, 406, Fig. 186. 

 hornets, colours of, 342, 343. 

 horns, excessive development, 406. 

 horse, evolution of, 307312, Figs. 



153158. 

 horse's feet (see foot of horse). 



skeleton, Fig. 95. 

 horses, Mendelian inheritance in, 205. 

 horse-worm (see Ascaris). 

 humble bee, robbing clover, 355, 



356. 



humerus, 237. 

 humming birds, as pollen carriers, 



353. 



distribution, 320. 

 ,, ,, epigamic orna- 



mentation, 349. 



hyacinth, mitosis in, 76, Figs. 33, 34. 

 hybridization, 194209. 



and evolution, 209. 



and mutation, 413, 



414. 



,, in cereals, 413. 



Hydra, 114-118, 265, Figs. 5759. 

 dispersal, 327. 

 , , suppression of inedusoid, 1 23. 

 hydranth, 119. 

 hydrocaulus, 119. 

 hydrotheca, 119. 

 Hydrozoa, 123. 

 hyperphalangy, 244. 

 hypertonic solution, producing par- 

 thenogenesis, 145. 

 hypoblast, 47, 48. 



of Amphioxus, 47, 266. 

 Frog, 269. 

 Hydra, 115, 118. 

 hypostome, 116, 119. 

 Hypsidse, 345. 

 Hyracotherium, 310. 



ICEBERGS, dispersal by, 324. 

 Ichthyopterygia (Ichthyosauria), 



297, Fig. 142. 

 paddles, 236, 244. 

 Ichthyosaurus communis, Fig. 142. 

 idants, 168. 

 identical twins, 173. 

 idioplasm, 167. 

 Idoliim diabolicum, 339. 

 ids, 168, 206. 

 igneous rocks, 282. 

 Iguanodon, 297, Fig. 143. 

 illegitimate unions, in Primula, 357. 

 immortality of germ cells, 162, 168. 



Protista, 161. 

 immutability of species, 

 Buff on on, 369. 

 Lamarck on, 374. 

 Linnaeus on, 222. 

 individual adaptation, 184. 



,, characters, transmission 



of, 175. 



,, variations, 150. 

 individuality of cells, 68. 

 inertia of germ, cells, 190. 

 inflorescences, variation in, 150. 

 Infusoria, 40, Fig. 41. 

 inheritance (see heredity). 



of acquired characters, 



165, 176193. 

 mutilations, 178, 179, 



