Child, mental development of, [204]

Christianity, [192], [250], [252]

Church, [265]

Circulatory system, worms, [62]; insects, [66]; vertebrates, [84]

Classification, [20]

Cœlenterata, [42], [55]

Conformity to environment, [150], [170], [177], [197], [243], [259], [265]

Conscience, [184]

Correlation of organs, [284]

Darwinism, [10]