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* Australia, South, variation in the skulls of aborigines of, 26.
 * Australians, colour of newborn children of, 557; relative height of the sexes of, 559; women a cause of war among the, 561.
 * Axis deer, sexual difference in the colour of the, 537.
 * Aymaras, measurements of the, 34; no grey hair among the, 559; hairlessness of the face in the, 561; long hair of the, 580.
 * Azara, on the proportion of men and women among the Guaranys, 244; on Palamedea cornuta, 366; on the beards of the Guaranys, 561; on strife for women among the Guanas, 561; on infanticide, 577, 592; on the eradication of the eyebrows and eyelashes by the Indians of Paraguay, 580; on polyandry among the Guanas, 593; celibacy unknown among the savages of South America, 594; on the freedom of divorce among the Charruas, 598.


 * Babbage, C., on the greater proportion of illegitimate female births, 244.
 * Babirusa, tusks of the, 518.
 * Baboon, revenge in a, 69; rage excited in, by reading, 71; manifestation of memory by a, 74; employing a mat for shelter against the sun, 82; protected from punishment by its companions, 103.
 * , Cape, mane of the male, 521; Hamadryas, mane of the male, 521.
 * Baboons, effects of intoxicating liquors on, 7; ears of, 15; diversity of the mental faculties in, 27; hands of, 50; habits of, 51; variability of the tail in, 58; manifestation of maternal affection by, 70; using stones and sticks as weapons, 81; co-operation of, 101; silence of, on plundering expeditions, 104; apparent polygamy of, 217; polygamous and social habits of, 590.
 * Bachman, Dr., on the fertility of mulattoes, 171.
 * Baer, K. E. von, on embryonic development, 9.
 * Bagehot, W., on the social virtues among primitive men, 117; slavery formerly beneficial, 117; on the value of obedience, 130; on human progress, 132; on the persistence of savage tribes in classical times, 183.
 * Bailly, E. M., on the mode of fighting of the Italian buffalo, 508; on the fighting of stags, 510.
 * Bain, A., on the sense of duty, 98; aid springing from sympathy, 103; on the basis of sympathy, 106; on love of approbation, &c., 109; on the idea of beauty, 584.
 * Baird, W., on a difference in colour between the males and females of some Entozoa, 260.
 * Baker, Mr., observation on the proportion of the sexes in pheasant-chicks, 247.
 * , Sir S., on the fondness of the Arabs for discordant music, 380; on sexual difference in the colours of an antelope, 536; on the elephant and rhinoceros attacking white or grey horses, 540; on the disfigurements practised by the negroes, 541; on the gashing of the cheeks and temples practised in Arab countries, 574; on the coiffure of the North Africans, 575; on the perforation of the lower lip by the women of Latooka, 575; on the distinctive characters of the coiffure of central African tribes, 576; on the coiffure of Arab women, 584.
 * "Balz" of the Black-cock, 363, 405.
 * Bantam, Sebright, 211, 238.
 * Banteng, horns of, 505; sexual differences in the colours of the, 536.
 * Banyal, colour of the, 579.
 * Barbarism, primitive, of civilised nations, 143.
 * Barbs, filamentous, of the feathers, in certain birds, 385, 430.
 * Barrago, F., on the Simian resemblances of man, 3.
 * Barr, Mr., on sexual preference in dogs, 524.
 * Barrington, Daines, on the language of birds, 86; on the clucking of the hen, 368; on the object of the song of birds, 369; on the singing of female birds, 370; on birds