BLEEDING, hereditary. -sexual limitation of excessive.

BLENDING of crossed races, time occupied by the.

BLINDNESS, hereditary. -at a certain age. -associated with colour of hair.

BLOODHOUNDS, degeneration of, caused by interbreeding.

BLUMENBACH, on the protuberance of the skull in Polish fowls. -on the effect of circumcision. -inheritance of a crooked finger. -on badger-dogs and other varieties of the dog. -on Hydra. -on the "nisus formativus."

BLYTH, E., on the pariah dog. -hybrids of dog and jackal. -early domestication of cats in India. -origin of domestic cat. -crossing of domestic and wild cats. -on Indian cats resembling Felis chaus. -on striped Burmese ponies. -on the stripes of the ass. -on Indian wild pigs. -on humped cattle. -occurrence of Bos frontosus in Irish crannoges. -fertile crossing of zebus and common cattle. -on the species of sheep. -on the fat-tailed Indian sheep. -origin of the goat. -on rabbits breeding in India. -number of tail-feathers in fantails. -Lotan tumbler pigeons. -number of tail-feathers in Ectopistes. -on Columba affinis. -pigeons roosting in trees. -on Columba leuconota. -on Columba intermedia of Strickland. -variation in colour of croup in pigeons. -voluntary domestication of rock-pigeons in India. -feral pigeons on the Hudson. -occurrence of sub-species of pigeons. -notice of pigeon-fanciers in Delhi, etc. -hybrids of Gallus sonneratii and the domestic hen. -supposed hybridity of Gallus temminckii. -variations and domestication of Gallus bankiva. -crossing of wild and tame fowls in Burmah. -restricted range of the larger gallinaceous birds. -feral fowls in the Nicobar Islands. -black-skinned fowls occurring near Calcutta. -weight of Gallus bankiva. -degeneration of the turkey in India. -on the colour of gold-fish. -reversion from a cross. -on the Ghor-Khur (Asinus indicus). -on Asinus hemionus. -number of eggs of Gallus bankiva. -on the breeding of birds in captivity. -co-existence of large and small breeds in the same country. -on the drooping ears of the elephant. -homology of leg and wing feathers.

BOETHIUS on Scotch wild cattle.

BOITARD and Corbie, on the breeds of pigeons. -Lille pouter pigeon. -notice of a gliding pigeon. -variety of the pouter pigeon. -dovecote pigeon. -crossing pigeons. -sterility of hybrids of turtle-doves. -reversion of crossed pigeons. -on the fantail. -on the trumpeter. -prepotency of transmission in silky fantail. -secondary sexual characters in pigeons. -crossing of white and coloured turtle-doves. -fertility of pigeons.

BOMBYCIDAE, wingless females of.

Bombyx hesperus.