i. 41;

on the instinctive dread of monkeys for serpents, i. 42; on a baboon using a mat for shelter from the sun, i. 53; on the use of stones as missiles by baboons, i. 51; on the signal-cries of monkeys, i. 57; on sentinels posted by monkeys, i. 74; on co-operation of animals, i. 75; on an eagle attacking a young _Cercopithecus_, i. 76; on baboons in confinement protecting one of their number from punishment, i. 78; on the habits of baboons when plundering, i. 79; on the diversity of the mental faculties of monkeys, i. 110; on the habits of baboons, i. 141; on polygamy in _Cynocephalus_ and _Cebus_, i. 266; on the numerical proportion of the sexes in birds, i. 306; on the love-dance of the Black-cock, ii. 45; on _Palamedea cornuta_, ii. 48; on the habits of the Black-grouse, ii. 49; on sound produced by Birds of Paradise, ii. 63; on assemblages of grouse, ii. 101; on the finding of new mates by birds, ii. 106; on the fighting of wild boars, ii. 263; on the habits of _Cynocephalus hamadryas_, ii. 362.

BRENT, Mr., on the courtship of fowls, ii. 117.

BRESLAU, numerical proportion of male and female births in, i. 301.

BRIDGMAN, Laura, i. 57.

BRIMSTONE butterfly, i. 393; sexual difference of colour in the, i. 409.

BRITISH, ancient, tattooing practised by, ii. 339.

BROCA, Prof., on the occurrence of the supra-condyloid foramen in the human humerus, i. 28; on the capacity of Parisian skulls at different periods, i. 146; on the influence of natural selection, i. 152; on hybridity in man, i. 220; on human remains from Les Eyzies, i. 237; on the cause of the difference between Europeans and Hindoos, i. 240.

BRODIE, Sir B., on the origin of the moral sense in man, i. 71.

BRONN, H. G., on the copulation of insects of distinct species, i. 342.

BRONZE period, men of, in Europe, i. 160.

BROWN, R., sentinels of seals generally females, i. 74; on the battles of seals, ii. 240; on the narwhal, ii. 242; on the occasional absence of the tusks in the female walrus,