ii. 321;

estimation of, among bearded nations, ii. 349; probable origin of the, ii. 379.

BEARDS, in monkeys, i. 192; of mammals, ii. 282.

BEAUTIFUL, taste for the, in birds, ii. 108; in the quadrumana, ii. 296.

BEAUTY, sense of, in animals, i. 63; appreciation of, by birds, ii. 111; influence of, ii. 338, 343; variability of the standard of, ii. 370.

BEAVAN, Lieut., on the development of the horns in _Cervus Eldi_, i. 288.

BEAVER, instinct and intelligence of the, i. 37, 38; voice of the, ii. 277; castoreum of the, ii. 279.

BEAVERS, battles of male, ii. 239.

BECHSTEIN, on female birds choosing the best singers among the males,