The Making of Species 
Greyhound, 364 
Grosbeak, 281, 284 
Groundsel, 260 
Grouse, red, 125 
Growth-force, 15, 16, 68 
Grus leucogeranus, 282 
Guillemot, 58, 190, 245 
Guinea-fowl, I00, 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 
HAECKEL, 15, 24 
Hemophilia, 340 
Halcyon smyrnensis, 202 
Halietus albicilla, 65 
Hare, 131, 185, 200 
Harrier, 1o1 
Hartebeeste, 363 
Hawk-cuckoo, 235, 236 
Hawk-eagle, 101 
Hawks, 222, 235, 236, 247, 277 
Hecki, 104 
Helice, 103 
Heliconide, 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 
A. niger, 334 
Hirundo rustica, 251 
1. 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, 322, 389, 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 
Hyana, 353 
Hybridism, 111-32, 292, 293 
Hydra, 21 
Hydrogen, 152, 153 
Hydrophasianus chirurgus, 250 
Hyla, 245 
Hypertely, 237, 240 
Hypolimnas misippus, 179, 180 
‘‘Ipis, THE,” 255, 256 
Icterus vulgaris, 244, 281, 284 
Impeyan pheasant, 104 
Indian Civil Service, 385, 386, 387 
Indian corn, 81 
Inheritance, 133-69 
—— alternative, 127 
— blended, 140, 148 
— definition of, 138 
—— of acquired characters, 10, 14, 
15, 18-24, 60, 107-10 
particulate, 140 
—— unilateral, 139, 140, 162 
Insectivores, 67 
Intercrossing, swamping effects of, 
42, 83 
Intimidating attitudes, 224, 225 
lora, 244 
Iridescence, 186 
Irish elk, 67, 168 
Isolation, 366-82, 387 
Isomerism, biological, 154-8 
— chemical, 152-4, 157 
Lthomiine, 228, 246 
Ivy, 261 
JACANA, 250 
Jackdaw, 51, 306 
Jaeger, 86 
394 
