, causes of colour in, 127.

FLYCATCHERS, genera of, absent from Celebes, 177.

FORBES, EDWARD, objections to his theory of Polarity, 17-23.

FORCE is probably all Will-force, 366.

GALAPAGOS, 10.

GALTON, Mr., on range of intellectual power, 339.

GANOCEPHALA, 298.

_Gastropacha querci_, protective colour and form of, 62.

GAUDRY, M., on fossil mammals of Greece, 299.

GEOGRAPHICAL distribution, dependent on geologic changes, 1;
its agreement with law of introduction of new species, 9;
of allied species and groups, 12.

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,