Sparrows, new mates found by.
Sparrows, sexes and young of; learning to sing.
Spathura Underwoodi.
Spawning of fishes.
Spear, used before dispersion of man.
Species, causes of the advancement of; distinctive characters of; or races of man; sterility and fertility of, when crossed; supposed, of man; gradation of; difficulty of defining; representative, of birds; of birds, comparative differences between the sexes of distinct.
Spectrum femoratum, difference of colour in the sexes of.
Speech, connection between the brain and the faculty of; connection of intonation with music.
Spel, of the black-cock.
Spencer, Herbert, on the influence of food on the size of the jaws; on the dawn of intelligence; on the origin of the belief in spiritual agencies; on the origin of the moral sense; on music.