FOLEY, Mr., wild varieties of pears.
FOLIAGE, inherited peculiarities of. -variegation of. -bud-variation in.
FOOD, influence of, on the pig. -on cattle. -excess of, a cause of variability.
FORBES, D., on Chilian sheep. -on the horses of Spain, Chili, and the Pampas.
Formica rufa.
FORTUNE, R., sterility of the sweet potato in China. -development of axillary bulbs in the yam.
FOWL, common, breeds of -supposed plurality of origin. -early history of. -causes of production of breeds of. -origin of, from Gallus bankiva. -feral, notices of. -reversion and analogous variation in. -"cuckoo" sub-breeds of. -history of. -structural characters of. -sexual peculiarities of. -external differences of. -differences of breeds of, from G. bankiva. -osteological characters of. -effects of disuse of parts in. -feral. -polydactylism in. -fertility of, increased by domestication. -sterility of, under certain conditions. -influence of selection on. -evils of close interbreeding of. -crossing of. -prepotency of transmission in. -rudimentary organs in. -crossing of non-sitting varieties of. -homology of wing and leg feathers in. -hybrids of, with pheasants and Gallus sonneratii. -black-skinned. -black, preyed upon by the osprey in Ireland. -five-toed, mentioned by Columella. -rumpless, tailed chickens produced by. -Dorking, crosses of. -form of comb and colour of plumage in. -game, crossing of white and black. -five-spurred. -Spanish, liable to suffer from frost. -Polish, peculiarities of skull of.
FOX, sterility of, in captivity.
FOX, S. BEVAN, races of bees.
FOX, W. DARWIN, gestation of the dog. -"Negro" cat. -reversion of sheep in colour. -period of gestation in the pig. -young of the Himalayan rabbit. -crossing of wild and domestic turkeys. -reversion in crossed musk ducks. -spontaneous segregation of varieties of geese. -effects of close interbreeding upon bloodhounds. -deafness of white cats with blue eyes.