Singhalese, [416]
Siouans, [528]
Skeleton of trunk and limbs, differentiative racial characters of, [83], [93]
Skin, structure of the, [34]; differences according to race, [36]
Skull, comparison of human skull and that of anthropoid apes, [18], [19]
Social groups, stages of, conditions of progress of, classification of “states of civilisation,” [123]–[127]
Social organisation, under group marriage, totemism, clan rule, [247]–[248]
Somalis, [438]
Somatological units, [3]