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moulting of Anthus, 392; on the moulting of bustards, plovers, and Gallus bankiva, 392; on the Indian honey-buzzard, 424; on sexual differences in the colour of the eyes of hornbills, 425; on Oriolus melanocephalus, 460; on Palœornis javanicus, 461; on the genus Ardetta, 461; on the peregrine falcon, 461; on young female birds acquiring male characters, 461; on the immature plumage of birds, 465; on representative species of birds, 468; on the young of Turnix, 476; on anomalous young of Lanius rufus and Colymbus glacialis, 482; on the sexes and young of the sparrows, 483; on dimorphism in some herons, 484; on the ascertainment of the sex of nestling bullfinches by pulling out breast-feathers, 484; on orioles breeding in immature plumage, 484; on the sexes and young of Buphus and Anastomus, 486; on the young of the blackcap and blackbird, 487; on the young of the stonechat, 487; on the white plumage ofAnastomus, 493; on the horns of Bovine animals, 505; on the horns of Antilope bezoartica, 507; on the mode of fighting of Ovis cycloceros, 508; on the voice of the Gibbons, 527; on the crest of the male wild goat, 531; on the colours of Portax picta, 535; on the colours of Antilope bezoartica, 536; on the colour of the Axis deer, 536; on sexual difference of colour in Hylobates hoolock, 537; on the hog-deer, 546; on the beard and whiskers in a monkey becoming white with age, 559.
 * Boar, wild, polygamous in India, 217; use of the tusks by the, 513; fighting of, 518.
 * Boardman, Mr., Albino birds in U. S., 419.
 * Boitard and Corbié, MM., on the transmission of sexual peculiarities in pigeons, 230; on the antipathy shewn by some female pigeons to certain males, 418.
 * Bold, Mr., on the singing of a sterile hybrid canary, 369.
 * Bombet, on the variability of the standard of beauty in Europe, 596.
 * Bombus, difference of the sexes in, 292.
 * Bombycidæ, coloration of, 313; pairing of the, 318; colours of, 318.
 * Bombycilla carolinensis, red appendages of, 461.
 * Bombyx cynthia, 278; proportion of the sexes in, 250, 253; pairing of, 318.
 * mori, difference of size of the male and female cocoons of, 278; pairing of, 318.
 * Pernyi, proportion of sexes of, 253.
 * Yamamai, 278; M. Personnat on, 251; proportion of sexes of, 253.
 * Bonaparte, C. L., on the call-notes of the wild turkey, 375.
 * Bond, F., on the finding of new mates by crows, 408.
 * Bone, implements of, skill displayed in making, 49.
 * Boner, C., on the transfer of male characters to an old female chamois, 504; on the habits of stags, 515; on the pairing of red deer, 522.
 * Bones, increase of, in length and thickness, when carrying a greater weight, 32.
 * Bonizzi, P., difference of colour in sexes of pigeons, 230.
 * Bonnet monkey, 151.
 * Bonwick, J., extinction of Tasmanians, 183, 184.
 * Boomerang, 145.
 * Boreus hyemalis, scarcity of the male, 254.
 * Bory St. Vincent, on the number of species of man, 174; on the colours of Labrus pavo, 342.
 * Bos etruscus, 505.
 * gaurus, horns of, 505.
 * moschatus, 529.
 * primigenius, 501.
 * sondaicus, horns of, 505; colours of, 536.
 * Botocudos, 144; mode of life of, 197; disfigurement of the ears and lower lip of the, 575.
 * Boucher de Perthes, J. C. de, on the antiquity of man, 2.
 * Bourbon, proportion of the sexes in a species of Papilio from, 250.