ABSTRACT
The application of the principles observed in hunting to the obtaining of goods found outside the limits of the district, led to certain forms of exchange which appear to us as trade. In many cases regular expeditions are made for the above purpose by almost all the full-grown male members of the group. The knowledge that some useful object is to be found in a certain place may possibly be attributed to the fact that the group in question once lived permanently or temporarily at the place in question, or, perhaps, branched off as a daughter-group from one living there, or gained such knowledge by marrying women from those parts. In the arrangements for these expeditions, which often bear the character of foreign trade, the principle of collectivity makes its appearance.
