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acquiring the songs of other birds, 370; on the muscles of the larynx in song birds, 371; on the want of the power of song by female birds, 450.
 * Barrow, on the widow-bird, 403.
 * Bartels, Dr., supernumerary mammæ in men, 37.
 * Bartlett, A. D., period of hatching of birds' eggs, 165; on the tragopan, 220; on the development of the spurs in Crossoptilon auritum, 236; on the fighting of the males of Plectropterus gambensis, 364; on the knot, 391; on display in male birds, 394; on the display of plumage by. the male Polyplectron, 396; on Crossoptilon auritum and Phasianus Wallichii, 400; on the habits of Lophophorus, 420; on the colour of the mouth in Buceros bicornis, 426; on the incubation of the cassowary, 478; on the Cape Buffalo, 508; on the use of the horns of antelopes, 509; on the fighting of male wart-hogs, 520; on Ammotragus tragelaphus, 531; on the colours of Cercopithecus cephus, 537; on the colours of the faces of monkeys, 550; on the naked surfaces of monkeys, 600.
 * Bartram, on the courtship of the male alligator, 351.
 * Basque language, highly artificial, 91.
 * Bate, C. S., on the superior activity of male; crustacea, 221; on the proportions of the sexes in crabs, 255; on the chelæ of crustacea, 266; on the relative size of the sexes in crustacea, 268; on the colours of crustacea, 270.
 * Bateman, Dr., tendency to imitation in certain diseased states, 72; on Aphasia, 88.
 * Bates, H. W., on variation in the form of the head of Amazonian Indians, 28; on the proportion of the sexes among Amazonian butterflies, 250; on sexual differences in the wings of butterflies, 277; on the field-cricket, 283; on Pyrodes pulcherrimus, 294; on the horns of Lamellicorn beetles, 295, 297; on the colours of Epicaliœ&c., 309; on the coloration of tropical butterflies, 311; on the variability of Papilio Sesostris and Childrenœ, 320; on male and female butterflies inhabiting different stations, 321; on mimicry, 323; on the caterpillar of a Sphinx, 325; on the vocal organs of the umbrella-bird, 374; on the toucans, 492; on Brachyurus calvus, 550.
 * Batokas, knocking out two upper incisors, 575.
 * Batrachia, 349; eagerness of male, 221.
 * Bats, scent-glands, 529; sexual differences in the colour of, 534; fur of male frugivorous, 534.
 * Battle, law of, 144; among beetles, 299; among birds, 360; among mammals, 500 et seq.; in man, 561.
 * Beak, sexual difference in the forms of the, 359; in the colour of the, 383.
 * Beaks, of birds, bright colours of, 491.
 * Beard, development of, in man, 557; analogy of the, in man and the quadrumana, 558; variation of the development of the, in different races of men, 559; estimation of, among bearded nations, 581; probable origin of the, 602.
 * , in monkeys, 150; of mammals, 531.
 * Beautiful, taste for the, in birds, 410; in the quadrumana, 540.
 * Beauty, sense of, in animals, 92; appreciation of, by birds, 413; influence of, 573, 576; variability of the standard of, 596.
 * Beavan, Lieut., on the development of the horns in Cervus Eldi, 234.
 * Beaver, instinct and intelligence of the, 67, 68; voice of the, 527; castoreum of the, 529.
 * Beavers, battles of male, 500.
 * Bechstein, on female birds choosing the best singers among the males, 368; on rivalry in song-birds, 369; on the singing of female birds, 370; on birds acquiring the songs of other birds, 370; on pairing the canary and siskin, 415; on a sub-variety of the monk pigeon, 427; on spurred hens, 449.
 * Beddoe, Dr., on causes of difference in stature, 31.