Goldfinch (_Astragalinus tristis_), flight song of, 43, 44; other notes of, 44; musical festivals of, 104. Gophers, an interesting incident, 237, 238. Grackle. _See_ Crow blackbird. Grebe, and loon, 235, 236. Gregariousness, its effect on individuality, 118, 119. Groos, Karl, his work on _The Play of Animals_, 87, 100. Grouse, flight of, 4. Grouse, ruffed (_Bonasa umbelius_), 71, 94; drumming of, 177, 257; the "Hermit's" incredible story of a, 179, 180; feeble vocal powers of, 257. Grouse, spruce, or Canada grouse (_Canachites canadensis canace_), 260. Hamerton, Philip Gilbert, his _Chapters on Animals_, 124, 237. Hawk, broad-winged (_Buteo platypterus_), 74. Hawk, fish, or American osprey (_Pandion haliaëtus carolinensis_), 213. Hawk, marsh (_Circus hudsonius_), a young, 99. Hawk, red-shouldered (_Buteo lineatus_), 222, 223. Hawk, red-tailed (_Buteo borealis_ and subsp.), 102. Hawks, alleged mimicry among, 248, 249. "Hermit," his false natural history, 93-95; his stories of cowbirds and a grouse, 178, 179. Hibernation, 48, 49. Hickory nut, 251, 252. _Home Life on an Ostrich Farm_, 135, 136. Homing instinct, the, a remarkable trait, 53; an instance of its workings, 53-57, 99; nature of, 235. Honeysuckle, a shoot of, 24, 25. Horses, ignorant fear in, 123; self-destruction of, 146, 162; a mare and her blind companion, 226, 227. Hyla, peeping, hibernation of, 48; a second period of peeping, 231, 232. Indigo-bird (_Cyanospiza cyanea_), flight song of, 44. Individuality, effects of solitude and gregariousness upon, 118, 119. _Industries of Animals_, 137. Inferences, right, 231-238. Insects stilled by the cold, 49, 50. Instinct, 1; demoralized, 73, 74; one instinct overcoming another, 74; makes up nine tenths of the lives of our wild neighbors, 74; a kind of natural reason, 76; in connection with parasitism, 79, 80; importance of, 81; origin and development of, 81, 82; not always inerrant, 155; machine-like action of, 158, 159; non-progressive, 212; nature of, 254-257; variability of, 257-261. Jackals, 142. Jackdaw, the Bishop of Carlisle's story of a, 148. Jay, blue (_Cyanocitta cristata_), Mr. Keyser's young bird, 69, 70; hiding instinct of, 161, 251, 263. Jay, Canada (_Perisoreus canadensis_), 204, 260. Jefferies, Richard, 131, 197, 203. Jesse, Edward, his story of some swallows, 148. Katydids, 49. Kea, 260, 261. Kearton, Richard, his story of an osprey, 137; on the wren's nest, 138, 139; on a colony of terns, 139; his experiments with wooden eggs, 227, 228; on instinct in animals, 257. Keyser, Leander S., his experiments with young birds, 69, 70. Kingbird (_Tyrannus tyrannus_), 177. Kipling, Rudyard, his _Jungle Book_, 14; his _The White Seal_, 14. Kittens, 75.