Ceylon, plants of, [375].
Chalk formation, [322].
Characters, divergence of, [111].
——, sexual, variable, [156].
——, adaptive or analogical, [426].
Charlock, [76].
Checks to increase, [67].
—— ——, mutual, [71].
Chickens, instinctive tameness of, [216].
Chthamalinæ, [289].