ory of natural selection, i. 11.
CLIMATE, effect of, upon breeds of dogs, i. 37;
on horses, i. 52, 53;
on cattle, i. 91, 92;
on the fleece of sheep, i. 98, 99;
on seeds of wheat, i. 316;
on cultivated cabbages, i. 325;
adaptation of maize to, i. 322.
CLIMATE and pasture, adaptation of breeds of sheep to, i. 96-97.
CLIMATE and soil, effects of, upon strawberries, i. 353.
CLINE, Mr., on the skull in horned and hornless rams, ii. 333.
CLOS, on sterility in _Ranunculus ficaria_, ii. 170.
CLOTZSCH, hybrids of various trees, ii. 130.
CLOVER, pelorism in, ii. 340.
COATE, Mr., on interbreeding pigs, ii. 122.
COCCUS of apple trees, ii. 231.
COCHIN fowls, i. 227, 250, 252, 260-261;
occipital foramen of, figured, i. 261;
section of skull of, figured, i. 263;
cervical vertebra of, figured, i. 267.
COCHINEAL, persistence of, ii. 236;
preference of, for a particular cactus, ii. 275.
_Cochlearia armoracia_, ii. 170.
COCK, game, natural selection in, ii. 225;
spur of, grafted on the comb, ii. 296;
spur of, inserted into the eye of an ox, ii. 369;
effect of castration upon the, ii. 51-52.
COCK'S-COMB, varieties of the, i. 365.
COCOONS, of silkworms, variations in, i. 302-303.
CODFISH, bulldog, i. 89;
number of eggs in the, ii. 379.
_Coelogenys paca_, ii. 152.
COLIN, prepotency of the ass over the horse, ii. 67-68;
on cross-breeding, ii. 97;
on change of diet, ii. 304.
COLLINSON, Peter, peach-tree producing a nectarine, i. 340.
COLORATION, in pigeons, an evidence of unity of descent, i. 195-197.
COLOUR, correlation of, in dogs, i. 28-29;
persistence of, in horses, i. 50;
inheritance and diversity of, in horses, i. 55;
variations of, in the ass, i. 62-63;
of wild or feral cattle, i. 85;
transmission of, in rabbits, i. 107;
peculiarities of, in Himalayan rabbits, i. 111;
influence of, ii. 227-230;
correlation of, in head and limbs, ii. 324;
correlated with constitutional peculiarities, ii. 335-338.
COLOUR and odour, correlation of, ii. 325.
COLOUR-BLINDNESS, hereditary, ii. 9;
more common in men than in women, ii. 72-73;
associated with inability to distinguish musical sounds, ii. 328.
COLOURS, sometimes not blended by crossing, ii. 92.
_Columba affinis_, Blyth, a variety of _C. livia_, i. 183.
_Columba amaliae_, Brehm, a variety of _C. livia_, i. 183.
_Columba gu