unconscious selection of, ii. 211-212;
valued by the Fuegians, ii. 215;
climatal changes in hair of, ii. 278;
production of drooping ears in, ii. 301;
{448}
rejection of bones of game by, ii. 303;
inheritance of rudiments of limbs in, ii. 315;
development of fifth toe in, ii. 317;
hairless, deficiency of teeth in, ii. 326;
short-faced, teeth of, ii. 345;
probable analogous variation in, ii. 349;
extinction of breeds of, ii. 425.
DOMBRAIN, H. H., on the auricula, ii. 346-347.
DOMESTICATION, essential points in, ii. 405-406;
favourable to crossing, ii. 109-110;
fertility increased by, ii. 111-113, 174.
DOMESTICATED animals, origin of, ii. 160-161;
occasional sterility of, under changed conditions, ii. 161-162.
DONDERS, Dr., hereditary hypermetropia, ii. 8.
DORKING fowl, i. 227, 261;
furcula of, figured, i. 268.
DORMOUSE, ii. 152.
DOUBLE FLOWERS, ii. 167-168, 171-172;
produced by selection, ii. 200.
DOUBLEDAY, H., cultivation of the filbert pine strawberry, i. 354.
DOUGLAS, J., crossing of white and black game-fowls, ii. 92.
DOWNING, Mr., wild varieties of the hickory, i. 310;
peaches and nectarines from seed, i. 339-340;
origin of the Boston nectarine, i. 340;
American varieties of the peach, i. 343;
North American apricot, i. 344;
varieties of the plum, i. 346;
origin and varieties of the cherry, i. 347-348;
"twin cluster pippins," i. 349;
varieties of the apple, i. 350;
on strawberries, i. 351, 353;
fruit of the wild gooseberry, i. 355;
effects of grafting upon the seed, ii. 26;
diseases of plum and peach trees, ii. 227-228;
injury done to stone fruit in America by the "weevil," ii. 231;
grafts of the plum and peach, ii. 259;
wild varieties of pears, ii. 260;
varieties of fruit-trees suitable to different climates, ii. 306.
_Draba sylvestris_, ii. 163.
DRAGON, pigeon, i. 139, 141.
"DRAIJER" (pigeon), i. 156.
DRINKING, effects of, in different climates, ii. 289.
DROMEDARY, selection of, ii. 205-206.
DRUCE, Mr., inter-breeding of pigs, ii. 121.
DU CHAILLU, fruit-trees in West Africa, i. 309.
DUCHESNE on _Fragaria vesca_, i. 351, 352, 353.
DUFOUR, Leon, on _Cecidomyia_ and _Misocampus_, i. 5.
DUCK, musk, retention of perching habit by the, i. 182;
feral hybrid of, i. 190.
DUCK, penguin, hybrid of, with Egyptian goose, ii. 68.
DUCK,