GEOLOGICAL distribution analogous to geographical, 13. GEOLOGY, facts proved by, 2-5. GIRAFFE, how it acquired its long neck, 42. GLAEA, autumnal colours of this genus, 62. GOULD, Mr., on sexual plumage of Gray Phalarope, 115; on incubation by male Dotterell, 115. _Grallina australis_, 254. GREEN birds almost confined to the tropics, 52. _Gymnocerus cratosomoides_, 94. _Gymnocerous capucinus_, 96. _Gymnocerous dulcissimus_, 97. GUNTHER, Dr., on arboreal snakes, 55; on colouring of snakes, 102. _Gynecia dirce_, 59. HABITS, often persistent when use of them has ceased, 234; of children and savages analogous to those of animals, 235; if persistent and imitative may be termed hereditary, 235, 236. HAIRY covering of Mammalia, use of, 344; absence of, in man remarkable, 345; the want of it felt by savages, 346; could not have been abolished by natural selection, 348. _Harpagus diodon_, 107. HEILIPLUS, a hard genus of Curculionidae, 94. HELICONIDAE, the objects of mimicry, 77; their secretions, 88; not attacked by birds, 79; sometimes mimicked by other Heliconidae, 85. HELLADOTHERIUM, 300. HEMIPTERA, protected by bad odour, 72. HERBERT, Rev. W., on song of birds, 221. HESPERIDAE, probable means of protection of, 176. HESTHESIS, longicorns resembling ants, 96. _Hestia leuconoe_, 180. HEWITSON, Mr., 131. HIPPARION, 299. HIPPOTHERIUM, 299. HISPIDAE, imitated by Longicorns, 92. HOLOTHURIDAE, 258. _Homalocranium semicinctum_, 101. HOOKER, Dr., on the value of the "specific term," 165. HOUSES of American and Malay races contrasted, 213. HUXLEY, Professor, on "Physical Basis of Life," 362; on volition, 368. HYAENICTIS, 300. HYBERNIA, wintry colours of this genus, 62. HYMENOPTERA, large number of, peculiar to Celebes, 196. ICTERIDAE, sexual colouring and nidification of, 244. ICTHYOPTERYGIA, 298. _Ideopsis daos_, 180. IMITATION, the effects of, in man's works, 212. INDIANS, how they travel through trackless forests, 207. INSECTS, protective colouring of, 56; mimicking species of other orders, 97; senses of, perhaps different from ours, 202, 203. INSTINCT, how it may be best studied, 201; definition of, 203; in many cases assumed without proof, 205; if possessed by man, 206; supposed, of Indians, 207; supposed to be shown in the construction of birds' nests, 211. INTELLECT of savages compared with that of animals, 341. INTELLECTUAL power, range of, in man, 339. _Iphias glaucippe_, 172. ITHOMIA, mimicked by Leptalis, 83. _Ithomia ilerdina_, mimicked by four groups of Lepidoptera, 84. JAVA, relations of, to Sumatra and Borneo, 193. JAMAICA swift altering position of nest, 228. JERDON, Mr., on incubation by males in Turnix, 115. _Kallima inachis_ and _Kallima paralekta_, wonderful resemblance of, to leaves, 59-61.