Serranus, hermaphroditism in.
Setina, noise produced by.
Sex, inheritance limited by.
Sexes, relative proportions of, in man; proportions of, sometimes influenced by selection; probable relation of the, in primeval man.
Sexual and natural selection, contrasted.
Sexual characters, effects of the loss of; limitation of.
Sexual characters, secondary; relations of polygamy to; transmitted through both sexes; gradation of, in birds.
Sexual differences in man.
Sexual selection, explanation of; influence of, on the colouring of Lepidoptera; objections to; action of, in mankind.
Sexual selection in spiders.