Horse tribe, pedigree of, 384
ancestral forms of, 386
Humming-birds, recognition marks of, 226
Huth, Mr., on close interbreeding, 160
Huxley, Professor on the struggle for existence, 37
on fossil crocodiles, 383
on anatomical peculiarities of the horse tribe, 384
on development of vertebrates, 448
on early man, 456
on brains of man and the gorilla, 457
Hybridity, remarks on facts of, 166
summary on, 184
Hybrids, infertility of, supposed test of distinct species, 152
fertility of, 159
fertile among animals, 162
between sheep and goat, 162
fertile between distinct species of moths, 163
fertile among plants, 163
Hymenopus bicornis, resembling flower, 212
I
Icterus Baltimore, diagram showing proportionate numbers which
vary, 63
Imitative resemblances, how produced, 205
Increase of organisms in a geometrical ratio, 25
Inedible fruits rarely coloured, 308
Insect and self-fertilisation, alternation of, in flowers, 328
Insect-fertilisation, facts relating to, 316
Insects, coloured for recognition, 226
warning colours of, 233
sexual coloration of, 269
importance of dull colours to female, 272
visiting one kind of flower at a time, 318
and flowers, the most brilliant not found together, 335
Insects, no proof of love of colour by, 336
and birds at sea, 357
in mid-ocean, 359
at great altitudes, 360
geological distribution of, 403
ancestral in Silurian, 405
fossil support evolution, 405
Instability of useless characters, 138
Instinct, the theory of, 441
Insular organisms illustrate powers of dispersal, 354
Interbreeding, close, injurious effects of, 160
supposed evil results of close, 326
Intercrossing, swamping effects of, 142
not necessarily useful, 325
Intermediate forms, why not found, 380
Islands, all oceanic are volcanic or coralline, 342
Isle of Man, small butterflies of, 106
Isolation, the importance of, 119
to prevent intercrossing, 144
by variations of habits, etc., 145
Rev. J.G. Gulick on, 147
when ineffective, 150
Ituna Ilione and Thyridia megisto, figures of wings of, 251
J
Jacobin, 93
Jenyns, Rev. L., on internal variations of mammalia, 69
Jordan, Mons. A., on varieties of Draba verna, 77
Judd, Professor, on dust fallen at Genoa, 363
on Hungarian fossil lacustrine shells, 381
K
Kerguelen Island, wingless insects of, 106
Kerivoula picta, protective colour of, 201
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