i. 216;

variability of the shape of the, i. 226; differences of, in the sexes in man, ii. 317; artificial modifications of the shape of, ii. 340.

SKUNK, odour emitted by the, ii. 279.

SLAVERY, prevalence of, i. 94; of women, ii. 366.

SLAVES, difference between those of field and house, i. 246.

SMELL, sense of, in man and animals, i. 23.

SMITH, Adam, on the basis of sympathy, i. 82.

SMITH, Sir A., on the recognition of women by male _Cynocephali_,