Blasius, Dr., on the species of European birds.
Bledius taurus, hornlike processes of male.
Bleeding, tendency to profuse.
Blenkiron, Mr., on sexual preference in horses.
Blennies, crest developed on the head of male, during the breeding season.
Blethisa multipunctata, stridulation of.
Bloch, on the proportions of the sexes in fishes.
Blood, arterial, red colour of.
Blood pheasant, number of spurs in.
Blow-fly, sounds made by.