includes the Iroquois, Maoris, and so forth, ranges from one thousand to five thousand; next come loosely organized states, such as Dahomey or Ashanti, where the numbers may reach one hundred thousand; whilst he makes barbarism culminate in more firmly compacted communities, such as are to be found, for example, in Abyssinia or Madagascar, the population of which he places at about half a million. Now I am very sceptical about Mr. Sutherland's statistics, and regard his bold attempt to assign the world's peoples each to their own rung on the ladder of universal culture as, in the present state of our knowledge, no more than a clever hypothesis; which some keen anthropologist of the future might find it well worth his while to put thoroughly to the test. At a guess, however, I am disposed to accept his general principle that, on the whole and in the long run, during the earlier stages of human evolution, the complexity and coherence of the social order follow upon the size of the group; which, since its size, in turn, follows upon the mode of the economic life, may be described as the food-group. Besides food, however, there is a second elemental condition which vitally affects the human race; and that is sex. Social organization thus comes to have a twofold aspect. On the one hand, and perhaps primarily, it is an organization of the food-quest. On the other hand, hardly less fundamentally, it is an organization of marriage. In what follows, the two aspects will be considered more or less together, as to a large extent they overlap. Primitive men, like other social animals, hang together naturally in the hunting pack, and no less naturally in the family; and at a very rudimentary stage of evolution there probably is very little distinction between the two. When, however, for some reason or other which anthropologists have still to discover, man takes to the institution of exogamy, the law of marrying-out, which forces men and women to unite who are members of more or less distinct food-groups, then, as we shall presently see, the matrimonial aspect of social organization tends to overshadow the politico-economic; if only because the latter can usually take care of itself, whereas to marry a perfect stranger is an embarrassing operation that might be expected to require a certain amount of arrangement on both sides. * * * * *