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.
Composit :
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, 360.
reefs, indicating movements of earth, 309.
Corn-crake, 185.
Correlation:
of growth in domestic productions, 11.
of growth, 143, 198.
Cowslip, 49.
Creation, single centres of, 352.
Crinum, 250.
Crosses, reciprocal, 258.
Crossing:
373