Domingo. -correlation of colour in. -gestation of. -hairless Turkish. -inter-crossing of different breeds of. -characters of different breeds of, discussed. -degeneration of European, in warm climates. -liability to certain diseases in different breeds of. -causes of differences of breeds discussed. -catching fish and crabs in New Guinea and Tierra del Fuego. -webbing of the feet in. -influence of selection in producing different breeds of. -retention of original habits by. -inheritance of polydactylism in. -feral. -reversion in fourth generation of. -of the Pacific Islands. -mongrel. -comparative facility of crossing different breeds of. -fertility of. -interbreeding of. -selection of, among the Greeks. -among savages. -unconscious selection of. -valued by the Fuegians. -climatal changes in hair of. -production of drooping ears in. -rejection of bones of game by. -inheritance of rudiments of limbs in. -development of fifth toe in. -hairless, deficiency of teeth in. -short-faced, teeth of. -probable analogous variation in. -extinction of breeds of.
DOMBRAIN, H.H., on the auricula.
DOMESTICATION, essential points in. -favourable to crossing. -fertility increased by.
DOMESTICATED animals, origin of -occasional sterility of, under changed conditions.
DONDERS, Dr., hereditary hypermetropia.
DORKING fowl. -furculum of, figured.
DORMOUSE.
DOUBLE flowers. -produced by selection.
DOUBLEDAY, H., cultivation of the filbert pine strawberry.
DOUGLAS, J., crossing of white and black game-fowls.
DOWNING, Mr., wild varieties of the hickory. -peaches and nectarines from seed. -origin of the Boston nectarine. -American varieties of the peach. -North American apricot. -varieties of the plum. -origin and varieties of the cherry. -"twin-cluster pippins." -varieties of the apple. -on strawberries. -fruit of the wild gooseberry. -effects of grafting upon the seed. -diseases of plum and peach tree. -injury done to stone fruit in America by the "weevil." -grafts of the plum and peach. -wild varieties of pears. -varieties of fruit-trees suitable to different climates.
DOWNING, Mr. J., sterility of shorthorns.
Draba sylvestris.
DRAGON (pigeon).
"DRAIJER" (pigeon).
DRINKING, effects of, in different climates.
DROMEDARY, selection of.
DRUCE, Mr., interbreeding. -value of cross breed of pigs.
DU CHAILLU, fruit-trees in West Africa.
DUCHESNE, on Fragaria vesca.
DUFOUR, LEON, on Cecidomyia and Misocampus.
DUCK, musk, retention of perching habit by the. -feral hybrid of.
DUCK, penguin, hybrid of, with Egyptian goose.
Duck, wild, difficulty of rearing. -effects of domestication on.
DUCKS, breeds of. -origin of. -history of. -wild, easily tamed. -fertility of breeds of, when crossed. -with the plumage of Anas boschas. -Malayan penguin, identical in plumage with English. -characters of the breeds of. -eggs of. -effects of use and disuse in. -feral, in Norfolk. -Aylesbury, inheritance of early hatching by. -reversion in, produced by crossing. -wildness of half-bred wild. -hybrids of, with the musk duck. -assumption of male plumage by. -crossing of Labrador and penguin. -increased fertility of, by domestication. -general fertility of, in confinement. -increase of size of, by care in breeding. -change produced by domestication in.
DUMERIL, AUG., breeding of Siredon in the branchiferous stage.
DUN-COLOURED horses, origin of.
DUREAU DE LA MALLE, feral pigs in Louisiana. -feral fowls in Africa. -bud-variation in the pear. -production of mules among the Romans.
Dusicyon silvestris.
DUTCH rabbit.
DUTCH roller pigeon.
DUTROCHET, pelorism in the laburnum.
DUVAL, growth of pears in woods in France.
DUVAL-JOUVE, on Leersia oryzoides.
DUVERNOY, self-impotence in Lilium candidum.
DZIERZON, variability in the characters and habits of bees.
EARLE, Dr., on colour-blindness.
EARS, of fancy rabbits. -deficiency of, in breeds of rabbits. -rudimentary, in Chinese sheep. -drooping. -fusion of.