The Variation of Animals and Plants under Domestication — Volume 2

by Charles Darwin

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.