Lndex 
Felis, 308. 
Fish, change of color, 16. 
Fishes, 7. 
Fishes, secondary sexual character of, 190. 
Flatfish, 137, 138. 
Flatworms, 417. 
Fleischmann, 45-57. 
Flounders, 228, 346, 347. 
Flowers, 9, 17, 21, 342, 399, 422, 429. 
Fly, 428. 
Foot of horse, 47. 
Forel, 5. 
Fossil horses, 52. 
Foxes, 210, 410. 
Franqueiros cattle, 315. 
Frogs, 193, 320, 382, 405. 
Frogs, cross-fertilization, 150. 
Fruit, down of, 133. 
Fundulus, 16, 
Galton, 236, 270-272, 289, 441. 
Gavials, 301. 
Geddes and Thompson, 417, 423, 426, 427. 
Geer, De, 178. 
Gegenbaur, 49. 
Gelasimus, 177. 
Geoffroy St.-Hilaire, 44, 67, 300-303. 
Geological evidence, 39. 
Gerbe, 429. 
Germinal selection, 154. 
Gibbon, 213. 
Gill clefts, 62, 63, 64, 73. 
Giraffe, 6, 203, 229, 248-249, 
Glacier, 28. 
Glowworm, 23. 
Goat, 206, 208. ° 
Gonionema, 399. 
Gorilla, 205, 
Gothic period, 47, 48. 
Gould, 197. 
Graba, 124, 125. 
Grafting, 153. 
Grasshoppers, 8, 188. 
Gray, 126. 
Greyhound, 134. 
Growth of plants, 17. 
Guillemots, 124. 
Guinea pigs, 232. 
Giinther, Igo. 
Gymnotus, 132. 
Haeckel, 48, 49, 56, 79, 71, 79, 80, 82. 
Hartman, 187. 
Heart, 66, 67. 
Heliconids, 160. 
Helix, 344, 345-346. 
Hemiptera, 181. 
467 
Heredity, 270. 
‘Hermaphroditic animals, 126. 
Hertwig, O., 78, 79, 80, 81, 82, 83. 
Hertwig, R., 447. 
Hieracium, 330, 331. 
Hildebrand, 148. 
Hill, 252. 
Hipparion, 51. 
Hippeastrum, 148. 
His, 71, 72. 
Holmes, 72. , 
Hornbills, 21g. 
Horns, 229. 
Horse, 42, 224. 
Horse-chestnut, 24. 
Hothura, 410. 
Hottentots, 212. 
Hudson, 140, 195, 409-412. 
Humming-birds, 6, 197, 228. 
Hurst, 75, 76, 77, 78. 
Huxley, 49, 156, 233. 
Hyatt, 259. 
Hybrids, 149, 239. 
Hydatina, 417. 
Hydroides, 348. 
Hylobates, 205. 
Hymenoptera, 181, 
Tee, 28. 
Ichneumonidz, 181. 
Idioplasm, 335. 
Immunity, 13. 
India cattle, 208. 
Infanticide, 25. 
Inorganic adaptations, 26. 
Insectivorous plants, 10, 
Insects, coloration of, 7; wingless, 228. 
Instinct, 25, 139, 140, 141. 
Trish elk, 247. 
Jackson, 260. 
Jaguar, 209. 
Japanese cock, 163. 
Jennings, 395. 
Jonghe, 314. 
Jordan, 292. 
Joseph, 428. 
Junco, 311. 
Kallima, 7, 161, 162, 358. 
Kangaroo, 229, 351. 
Katydid, 8. 
Kent, W. Saville, 191. 
Kidneys, 66. 
Kielmeyer, 58. 
Kirby, 232. 
Kiwi, 354. 
