increase of beings, 68.
----, adaptation of, to organisms, 139.
{493}
Cobites, intestine of, 190.
Cockroach, 76.
Collections, palaeontological, poor, 288.
Colour, influenced by climate, 132.
----, in relation to attacks by flies, 198.
Columba livia, parent of domestic pigeons, 23.
Colymbetes, 386.
Compensation of growth, 147.
Compositae, outer and inner florets of, 144.
----, male flowers of, 451.
Conclusion, general, 480.
Conditions, slight changes in, favourable to fertility, 267.
Coot, 185.
Coral-islands, seeds drifted to, 361.
---- reefs, indicating movements of earth, 310.
Corn-crake, 186.
Correlation of growth in domestic productions, 11.
---- of growth, 143, 198.
Cowslip, 49.
Creation, single centres of, 352.
Crinum, 250.
Crosses, reciprocal, 258.
Crossing of domestic animals, importance in altering breeds, 20.
----, advantages of, 96.
---- unfavourable to selection, 102.
Crustacea of New Zealand, 376.
Crustacean, blind, 137.
Cryptocerus, 239.
Ctenomys, blind, 137.
Cuckoo, instinct of, 216.
Currants, grafts of, 262.
Currents of sea, rate of, 360.
Cuvier on conditions of existence, 206.
---- on fossil monkeys, 304.
----, Fred., on instinct, 208.

D.

Dana, Prof., on blind cave-animals, 139.
----, on relations of crustaceans of Japan, 372.
----, on crustaceans of New Zealand, 376.
De Candolle on struggle for existence, 62.
---- on umbelliferae, 146.
---- on general affinities, 430.
----, Alph., on low plants, widely dispersed, 406.
----, ----, on widely-ranging plants being variable, 53.
----, ----, on naturalisation, 115.
----, ----, on winged seeds, 146.
----, ----, on Alpine species suddenly becoming rare, 175.
----, ----, on distribution of plants with large seeds, 360.
----, ----, on vegetation of Australia, 379.
----, ----, on fresh-water plants, 386.
----, ----, on insular plants, 389.
Degradation of coast-rocks, 282.
Denudation, rate of, 285.
---- of oldest rocks, 308.
Development of ancient forms, 336.
Devonian system, 334.
Dianthus, fertility of crosses, 256.
Dirt on feet of birds, 362.
Dispersal, means of, 356.
---- during glacial period, 365.
Distribution, geographical, 346.
----, means of, 356.
Disuse, effects of, under nature, 134.
Divergence of character, 111.
Division, physiological, of labour, 115.
Dogs, hairless, with imper