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male ruminants, 53; large, in the early progenitors of man, 160.
 * Canines, and horns, inverse development of, 514.
 * Canoes, use of, 48, 180.
 * Cantharis, difference of colour in the sexes of a species of, 294.
 * Cantharus lineatus, 341.
 * Capercailzie, polygamous, 219; proportion of the sexes in the, 248; pugnacity of the male, 363; pairing of the, 367; autumn meetings of the, 370; call of the, 375; duration of the courtship of, 405; behaviour of the female, 419; inconvenience of black colour to the female, 444; sexual difference in the coloration of the, 491; crimson eye-cere of the male, 491.
 * Capitonidæ, colours and nidification of the, 455.
 * Capra œgagrus, 508; crest of the male, 531; sexual difference in the colour of, 536.
 * Capreolus Sibiricus subecaudatus, 542.
 * Caprice, common to man and animals, 93.
 * Caprimulgus, noise made by the males of some species of, with their wings, 376.
 * virginianus, pairing of, 366.
 * Carabidæ, 302.
 * Carbonnier, on the natural history of the pike, 249; on the relative size of the sexes in fishes, 335; courtship of Chinese Macropus, 341.
 * Carcineutes, sexual difference of colour in, 457.
 * Carcinus mœnas, 268, 269.
 * Cardinalis virginianus, 225.
 * Carduelis elegans, sexual differences of the beak in, 360.
 * Carnivora, marine, polygamous habits of, 218; sexual differences in the colours of, 534.
 * Carp, numerical proportion of the sexes in the, 249.
 * Carr, R., on the peewit, 366.
 * Carrier pigeon, late development of the wattle in the, 238.
 * Carrion beetles, stridulation of, 302.
 * Carus, Prof. V., on the development of the horns in merino sheep, 235.
 * Cassowary, sexes and incubation of the, 478.
 * Castina, mode of holding wings, 315.
 * Castoreum, 529.
 * Casuarius galeatus, 478.
 * Cat, convoluted body in the extremity of the tail of a, 23; sick, sympathy of a dog with a, 103.
 * Cataract in Cebus Azarœ, 7.
 * Catarrh, liability of Cebus Azarœ to, 7.
 * Catarrhine monkeys, 153.
 * Caterpillars, bright colours of, 325.
 * Cathartes aura, 416.
 * jota, love-gestures of the male, 380.
 * Catlin, G., correlation of colour and texture of hair in the Mandans, 197; on the development of the beard among North American Indians, 560; on the great length of the hair in some North American tribes, 580.
 * Caton, J. D., on the development of the horns in Cervus virginianus and strongyloceros, 234; on the presence of traces of horns in the female wapiti, 504; on the fighting of deer, 510; on the crest of the male wapiti, 531; on the colours of the Virginian deer, 535; on sexual differences of colour in the wapiti, 536; on the spots of the Virginian deer, 546.
 * Cats, dreaming, 74; tortoise-shell, 230, 232, 237; enticed by valerian, 530; colours of, 543,
 * Cattle, rapid increase of, in South America, 47; domestic, lighter in winter in Siberia, 229; horns of, 234, 505; domestic, sexual differences of, late developed, 238; numerical proportion of the sexes in, 246.
 * Caudal vertebræ, number of, in macaques and baboons, 58; basal, of monkeys, imbedded in the body, 59.
 * Cavolini, observations on Serranus, 162.
 * Cebus, maternal affection in a, 70; gradation of species of, 175.
 * Apella, 205.
 * Azarœ, liability of, to the same diseases as man, 7; distinct sounds produced by, 84; early maturity of the female, 558.
 * capucinus, polygamous, 217; sexual differences of colour in, 537; hair on the head of, 549.