artificial and natural, ii. [413]-[414];
extinction of, ii. [425];
of domestic cats, i. 45-47;
of pigs produced by crossing, i. 78;
of cattle, i. 86-87, 91-93;
of goats, i. 101.
Brehm, on Columba amaliæ, i. 183.
Brent, B. P., number of mammæ in rabbits, i. 106;
habits of the tumbler pigeon, i. 151;
Laugher pigeon, i. 155;