Page:Descent of Man 1875.djvu/642

626

* Bee-eater, 371.
 * Bees, 99; pollen-baskets and stings of, 63; destruction of drones and queens by, 106; female, secondary sexual characters of, 208; proportion of sexes, 254; difference of the sexes in colour and sexual selection, 292.
 * Beetle, luminous larva of a, 277.
 * Beetles, 294; size of the cerebral ganglia in, 54; dilatation of the fore tarsi in male, 275; blind, 294; stridulation of, 301.
 * Belgium, ancient inhabitants of, 182.
 * Bell, Sir C., on emotional muscles in man, 3; "snarling muscles," 41; on the hand, 51.
 * , T., on the numerical proportion of the sexes in moles, 247; on the newts, 348; on the croaking of the frog, 350; on the difference in the coloration of the sexes in Zootoca vivipara, 357; on moles fighting, 500.
 * Bell-bird, sexual difference in the colour of the, 389.
 * Bell-birds, colours of, 492.
 * Belt, Mr., on the nakedness of tropical mankind, 57; on a spider-monkey and eagle, 102; habits of ants, 147; Lampyridæ distasteful to mammals, 277; mimicry of Leptalides, 325; colours of Nicaraguan frogs, 349; display of humming-birds, 443; on the toucans, 492; protective colouring of skunk, 543.
 * Benevolence, manifested by birds, 411.
 * Bennett, A. W., attachment of mated birds, 411; on the habits of Dromœus irroratus, 478.
 * , Dr., on birds of paradise, 396.
 * Berbers, fertility of crosses with other races, 171.
 * Bernicla antarctica colours of, 492.
 * Bernicle gander pairing with a Canada goose, 414.
 * Bert, M., crustaceans distinguish colours, 271.
 * Bertillon, M., arrested development and polydactylism, 37.
 * Bettoni, E., on local differences in the nests of Italian birds, 456.
 * Beyle, M., see Bombet.
 * Bhoteas, colour of the beard in, 558.
 * Bhringa, disciform tail-feathers of, 392.
 * Bianconi, Prof., on structures as explained through mechanical principles, 24.
 * Bibio, sexual differences in the genus, 280.
 * Bichat, on beauty, 585.
 * Bickes, proportion of sexes in man, 243.
 * Bile, coloured, in many animals, 261.
 * Bimana, 149.
 * Birds, imitations of the songs of other birds by, 73; dreaming, 74; killed by telegraph wires, 80; language of, 86; sense of beauty in, 92; pleasure of, in incubation, 105; male, incubation by, 163; and reptiles, alliance of, 165; sexual differences in the beak of some, 208; migratory, arrival of the male before the female, 212; apparent relation between polygamy and marked sexual differences in, 220; monogamous, becoming polygamous under domestication, 220; eagerness of male in pursuit of the female, 221; wild, numerical proportion of the sexes in, 247; secondary sexual characters of, 358; difference of size in the sexes of, 362; fights of male, witnessed by females, 367; display of male, to captivate the females, 367; close attention of, to the songs of others, 368; acquiring the song of their foster-parents, 370; brilliant, rarely good songsters, 371; love-antics and dances of, 380; coloration of, 385 et seq.; moulting of, 390 et seq.; unpaired, 407; male, singing out of season, 409; mutual affection of, 410; in confinement, distinguish persons, 411; hybrid, production of, 414; Albino, 419; European, number of species of, 422; variability of, 422; geographical distribution of colouring, 422; gradation of secondary sexual characters in, 430; obscurely coloured, building concealed nests, 454; young female, acquiring male characters, 462; breeding in immature plumage, 484; moulting of, 484; aquatic,