inea_, i. 182.
_Columba gymnocyclus_, Gray, a form of _C. livia_, i. 184.
_Columba gymnophthalmos_, hybrids of, with _C. oenas_, i. 193;
with _C. maculosa_, i. 194.
_Columba intermedia_, Strickland, a variety of _C. livia_, i. 184.
_Columba leucocephala_, ii. 155.
_Columba leuconota_, i. 182, 195.
_Columba littoralis_, i. 182.
_Columba livia_, ii. 29, 40;
the parent of domestic breeds of pigeons, i. 183;
measurements of, i. 134;
figured, i. 135;
skull figured, i. 163;
lower jaw figured, i. 164, 168;
scapula figured, i. 167.
_Columba luctuosa_, i. 182.
_Columba migratoria_ and _leucocephala_, diminished fertility of, in
captivity, ii. 155.
_Columba oenas_, i. 183;
crossed with common pigeon and _C. gymnophthalmos_, i. 193.
_Columba palumbus_, i. 193, ii. 350.
_Columba rupestris_, i. 182, 184, 195.
_Columba Schimperi_, i. 184.
_Columba torquatrix_, ii. 350.
_Columba turricola_, i. 184.
COLUMBIA, cattle of, i. 88.
COLUMBINE, double, i. 365, ii. 330.
{444}
COLUMBUS, on West Indian dogs, i. 23.
COLUMELLA, on Italian shepherd's dogs, i. 23;
on domestic fowls, i. 231, 247, ii. 202, 429;
on the keeping of ducks, i. 277;
on the selection of seed-corn, i. 318;
on the benefits of change of soil to plants, ii. 146;
on the value of native breeds, ii. 313.
COLZA, i. 325.
COMB, in fowls, variations of, i. 253-254;
sometimes rudimentary, ii. 315.
COMPENSATION, law of, i. 274.
COMPENSATION of growth, ii. 342-344.
COMPLEXION, connexion of, with constitution, ii. 335.
COMPOSITAE, double flowers of, i. 365, ii. 167, 316.
CONCEPTION, earlier in Alderney and Zetland cows than in other breeds, i.
87.
CONDITIONS of life, changed, effect of, ii. 418-419;
on horses, i. 52;
upon variation in pigeons, i. 212-213;
upon wheat, i. 315-316;
upon trees, i. 361;
in producing bud-variation, i. 408;
advantages of, ii. 145-148, 176-177;
sterility caused by, ii. 148-165;
conducive to variability, ii. 255-261, 394;
accumulative action of, ii. 261-263;
direct action of, ii. 271-292.
CONDOR, breeding in captivity, ii. 154.
CONFINEMENT, effect of, upon the cock, ii. 52.
CONFUCIUS, on the breeding of rabbits in China, i. 103.
CONOLLY, Mr., on Angora goats, ii. 326.
CONSTITUTIONAL differences in sheep, i. 96-97;
in varieties of apples, i. 349-350;
in pelargoni