INDEX 



441 



heredity, mnemic theory, 186, 191, 

 192. 



,, nature of problem, 163. 



,, Pearson on, 210. 



,, Weistaann's theory, 166 



174. 



Heriug, E., 186. 



hermaphrodite, 103, 105, 113, 114. 

 hermaphroditism, 93, 116, 125, 402. 

 heterogamy, 144. 

 Heteromita, 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 heidelhergensis, 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, Robert, 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, 307 312, 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, 114118, 265, Figs. 5759. 

 ,, dispersal, 327. 

 ,, suppression of medusoid, 123. 

 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. 



I. 



ICEBERGS, dispersal by, 324. 

 Ichthyopterygia (Ichthyosauria), 



297, Fig. 142. 

 paddles, 236, 244. 

 Ichthyosaurus communis, Fig. 142. 

 idants, 168. 

 identical twins, 173. 

 idioplasm, 167. 

 Idvlnm 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, 



Buffon 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. 



