Cucurbita_, dwarf, correlation of leaves in, ii. 330.
_Cucurbita maxima_, i. 357, 359.
_Cucurbita moschata_, i. 357, 359.
_Cucurbita pepo_, i. 357, ii. 108;
varieties of, i. 358;
relation in size and number of fruit of, ii. 343.
CUCURBITACEAE, i. 357-360;
supposed crossing of, i. 399;
Naudin's observations on hybrids of, ii. 172;
acclimatisation of, ii. 313.
"CULBUTANTS" (pigeons), i. 150.
CULTIVATION of plants, origin of, among savages, i. 309-310;
fertility increased by, ii. 111-113.
CUNIER, on hereditary night-blindness, ii. 9.
CURRANTS, of Tierra del Fuego, i. 309;
bud-variation in, i. 376.
CURTIS, Mr., bud-variation in the rose, i. 381.
CUVIER, on the gestation of the wolf, i. 29;
the odour of the jackal, an obstacle to domestication, i. 30;
differences of the skull in dogs, i. 34;
external characters of dogs, i. 35;
elongation of the intestines in domestic pigs, i. 73, ii. 303;
fertility of the hook-billed duck, i. 277;
number of digits, ii. 13;
hybrid of ass and zebra, ii. 42;
breeding of animals in the Jardin des Plantes, ii. 149;
sterility of predaceous birds in captivity, ii. 154;
facility of hybridisation in confinement, ii. 160.
CYANOSIS, affection of fingers in, ii. 332.
CYCLAMEN, bud-variation in, i. 382.
_Cynara cardunculus_, ii. 34.
_Cynips fecundatrix_, ii. 283.
_Cynocephalus hamadryas_, ii. 153.
_Cyprinus auratus_, i. 296-297.
_Cyrtanthus_, ii. 139.
_Cyrtopodium_, ii. 134.
_Cytisus Adami_, ii. 364;
its bud-variation, i. 387-389, 406, ii. 37;
seedlings from, i. 388;
different views of its origin, i. 389-390;
experiments in crossing _C. purpureus_ and _laburnum_ to produce, i.
389;
its production by M. Adam, i. 390;
discussion of origin of, i. 396.
_Cytisus alpino-laburnum_, ovules and pollen of, i. 389;
origin of, i. 390.
_Cytisus alpinus_, i. 388.
_Cytisus laburnum_, i. 387, 389, 390, 396.
_Cytisus purpureo-elongatus_, ovules and pollen of, i. 389;
production of, i. 390.
_Cytisus purpureus_, i. 387, 388, 389, 390, 396.

DAHLBOM, effects of food on hymenoptera, ii. 281.
DAHLIA, i. 369-370, ii. 147;
bud-variation by tubers in the, i. 385;
improvement of, by selection, ii. 216;
steps in cultivation of, ii. 261;
effect of conditions of life on, ii. 273;
correlation of form and colour in, ii. 331.
DAISY, he