A man runs away with his neighbour's wife or one of them, and secretes himself in some out of the way spot until he gathers information that she is replaced, when he can again make his appearance, finding the whole difficulty smoothed over. In their matrimonial relations they are very loose--monogamy, polygamy, communism, and promiscuity all apparently existing amongst them. They allow the women great liberty and frequently change their mates or simply discard them when they are perhaps taken up by another. They believe in a devil or evil spirit which haunts the woods, and call him Zamáro.[353] In all these cases, and I do not, of course, exhaust the evidence, there is enough to suggest that the social forms presented are of the most rudimentary kind. Conjecture has not and, I think, cannot get further back than such evidence as this. The social grouping is supported by outside influences rather than internal organisation; neither blood kinship nor marital kinship is recognised; hostility to all other groups and from other groups is the basis of inter-groupal life. To these significant characteristics has to be added the special birth custom and belief of the Semang pygmies. It is clear that the soul-bird belief and the tree-naming custom are different phases of one conception of social life, a conception definitely excluding recognition of blood kinship, and derived from the conscious adoption of an experience which has not reached the stage of blood kinship, but which includes a close association with natural objects. All this makes it advisable to take fuller count of pygmy culture than has hitherto been given to it. The pygmies have in truth always been a problem in man's history. From the time of Homer, Herodotos, and Aristotle, the pygmies have had their place among the observable types of man, or among the traditions to which observers have given credence. In modern times they have been accounted for either as peoples degraded from a higher level of culture, or as peoples who have never advanced. But whether we look upon these people as the last remnants of the primitive condition of hostility or whether they are reversions to that condition by reason of like causes, they bring before us what conjectural research has prepared us for. The first supposition is neither impossible nor incredible. The slow spreading-out in hostile regions would allow of the preservation of some examples of preference for unrestrained licence at the expense of constant hostility, in place of a modified peacefulness at the expense of restricted freedom in matters so dear to the human animal as sexual choice and power. The second supposition contains an element of human history which must find a place in anthropological research. The possible phases of social formation are very limited. If any section of mankind cannot develop in one direction, they will stagnate at the stage they have reached, or they will retrograde to one of the stages