divergence of, 111.
sexual, variable, 156.
adaptive or analogical, 427.
Charlock, 76.
Checks:
to increase, 67.
mutual, 71.
Chickens, instinctive tameness of, 216.
Chthamalin , 288.
Chthamalus, cretacean species of, 304.
Circumstances favourable:
to selection of domestic products, 40.
to natural selection, 101.
Cirripedes:
capable of crossing, 101.
carapace aborted, 148.
their ovigerous frena, 192.
fossil, 304.
larv of, 440.
Classification, 413.
Clift, Mr., on the succession of types, 339.
Climate:
effects of, in checking increase of beings, 68.
adaptation of, to organisms, 139.
Cobites, intestine of, 190.
Cockroach, 76.
Collections, pal ontological, poor, 287.
372