G Gadow, Dr, 197, 245 Gadwall, 126, 315 Galton, 81, 82, 374 “Game Birds and Wild Fowl of India,” 131 Gametes, segregation of, 143-5 Gannet, 282 Gayal, 126 Gauchos, 359 Gecko, 210 Geddes, 306, 326 Gemmules, 151 “Genesis of Species,” 7, 61 Geographical isolation, 375 Geological record, imperfection of, 40-2, 94 Geranium, 260 Germ-plasm, continuity of the, 25 Germinal variations, 106-10 _Geum urbanum_, 263 Gibbon ape, 101 Giraffe, 17, 18, 192, 196 _Globicera_, 104 Glutton, 190 Goat, 283 Goethe, 2 Golden pheasant, 97, 129, 149, 337, 338 Golden tench, 101 Goldfinch, 127, 255 Goldfish, 101, 102 Goose, 99, 100, 105, 115, 121, 130, 190, 281, 316, 334, 339 Gordon’s currant, 119 Goshawk, 247 Gouldian Finch, 99 Graba, 58 Gradation of colour, principle of, 185 _Graculipica melanoptera_, 244 “Grammar of Science, The,” 309 Grass, 273 Grasshopper, 185 Greenfinch, 122 Greyhound, 364 Grosbeak, 281, 284 Groundsel, 260 Grouse, red, 125 Growth-force, 15, 16, 68 _Grus leucogeranus_, 282 Guillemot, 58, 190, 245 Guinea-fowl, 100, 127, 128, 279, 362 Guinea-pig, 95, 101, 129, 283 Gulick, 369, 372-7, 380 Gull, 190, 191, 207, 247, 290, 355 _Gygis_, 278 Gyrfalcon, 190 H Haeckel, 15, 24 Hæmophilia, 340 _Halcyon smyrnensis_, 202 _Haliœtus albicilla_, 65 Hare, 131, 185, 200 Harrier, 101 Hartebeeste, 363 Hawk-cuckoo, 235, 236 Hawk-eagle, 101 Hawks, 222, 235, 236, 247, 277 _Hecki_, 104 Helice, 103 _Heliconidæ_, 175, 215, 216, 228 Heloderm, 217 Henslow, 15, 22, 23, 47, 48, 259 “Heredity,” 103, 145, 166, 340 “Heredity of Acquired Characters in Plants,” 22, 48 “Heredity of Sexual Characters in relation to Hormones,” 19, 330 Heron, 250, 317 Herring, 193 Hertwig, 151 Heusinger, 357 Hewitt, Mr, 307 _Hierococcyx varius_, 235, 248 Hilversum, 84 Himalayan argali, 120 Hinny, 127, 136, 140, 162 _Hipparchia, semele_, 205 _Hippotragus equinus_, 334 _H. niger_, 334 _Hirundo rustica_, 251 _H. tytleri_, 251 “History of Creation,” 24 Hobby, 250, 251 Homogamy, 370 Honeyeater, 281 Hormones, 335, 338 Hornbill, 65, 220 Horner, 340 Horse, 61, 68, 69, 95, 96, 100, 101, 117, 127, 128, 140, 266, 267, 268, 272, 283, 332, 352, 363, 364, 374 Horse, genealogy of, 41 Houghton, 91 Howard, 315, 332 Hubrecht, 26 Hume, 131 Humming-bird, 328 Hutton, 3 Hutton, Captain, 115, 382 Huxley, 3, 6, 11, 40, 100, 111 Hyæna, 353 Hybridism, 111-32, 292, 293 Hydra, 21 Hydrogen, 152, 153 _Hydrophasianus chirurgus_, 250 _Hyla_, 245 Hypertely, 237, 240 _Hypolimnas misippus_, 179, 180