Page:Descent of Man 1875.djvu/639

Rh

* Ardeola, young of, 468.
 * Ardetta, changes of plumage in, 461.
 * Argenteuil, 22.
 * Argus pheasant, 384, 403, 462; display of plumage by the male, 398; ocellated spots of the, 428; gradation of characters in the, 434.
 * Argyll, Duke of, on the physical weakness of man, 63; the fashioning of implements peculiar to man, 82; on the contest in man between right and wrong, 125; on the primitive civilisation of man, 143; on the plumage of the male Argus pheasant, 398; on Urosticte Benjamini, 442, 443; on the nests of birds, 453.
 * Argynnis, colouring of the lower surface of, 314.
 * Aricoris epitus, sexual differences in the wings of, 277.
 * Aristocracy, increased beauty of the, 586.
 * Arms, proportions of, in soldiers and sailors, 32; direction of the hair on the, 151.
 * and hands, free use of, indirectly correlated with diminution of canines, 53.
 * Arrest of development, 35, 36.
 * Arrow-heads, stone, general resemblance of, 179.
 * Arrows, use of, 179.
 * Arteries, variations in the course of the, 26.
 * Artery, effect of tying, upon the lateral channels, 32.
 * Arthropoda, 265.
 * Arts practised by savages, 179.
 * Ascension, coloured incrustation on the rocks of, 263.
 * Ascidia, affinity of the lancelet to, 159; tadpole-like larvæ of, 159.
 * Ascidians, 262; bright colours of some, 260.
 * Asinus, Asiatic and African species of, 548.
 * tœniopus, 548.
 * Ass, colour-variations of the, 547.
 * Ateles, effects of brandy on an, 7; absence of the thumb in, 51.
 * beelzebuth, ears of, 15.
 * marginatus, colour of the ruff of, 537; hair on the head of, 549.
 * Ateuchus, stridulation of, 306.
 * Ateuchus, cicatricosus, habits of, 300.
 * Athalia, proportions of the sexes in, 254.
 * Atropus pulsatorius, 291.
 * Attention, manifestations of, in animals, 73.
 * Audouin, V., on a hymenopterous parasite with a sedentary male, 221.
 * Audubon, J. J., on the pinioned goose, 105; on the speculum of Mergus cucullatus, 236; on the pugnacity of male birds, 362, 366; on Tetrao cupido, 367; on Ardea nycticorar, 368; on Sturnella ludoviciana, 368; on the vocal organs of Tetrao cupido, 371; on the drumming of the male Tetrao umbellus, 375; on sounds produced by the nightjar, 376; on Ardea herodias and Cathartes jota, 380; on Mimus polyglottus, 393; on display in male birds, 394; on the spring change of colour in some finches, 394; recognition of a dog by a turkey, 412; selection of mate by female birds, 416; on the turkey, 411, 412, 419; on variation in the male scarlet tanager, 424; on the musk-rat, 542; on the habits of Pyranga œstiva, 453; on local differences in the nests of the same species of birds, 456; on the habits of woodpeckers, 458; on Bombycilla carolinensis, 461; on young females of Tyranga œstiva acquiring male characters, 462; on the immature plumage of thrushes, 464; on the immature plumage of birds, 465 et seq.; on birds breeding in immature plumage, 484; on the growth of the crest and plumes in the male Ardea ludoviciana, 485; on the change of colour in some species of Ardea, 494.
 * Audubon and Bachman, M.M., on squirrels fighting, 500; on the Canadian lynx, 521.
 * Aughey, Prof., on rattlesnakes, 353.
 * Austen, N.L., on Anolis cristatellus, 354.
 * Australia, not the birthplace of man, 155; half-castes killed by the natives of, 170; lice of the natives of, 170; prevalence of female infanticide in, 592.