i. 386;

on butterflies being attracted by a dead specimen of the same species, i. 400.

COLOMBIA, flattened heads of savages of, ii. 340.

COLONISTS, success of the English as, i. 179.

COLORATION, protective, in birds, ii. 223.

COLOUR, supposed to be dependent on light and heat, i. 115; correlation of, with immunity from certain poisons and parasites,