[L] This may account for the use made of old women as heralds. They are doubly available for that purpose, since they are worthless for warfare, and are supposed to be endowed with specific powers of sorcery (Westermarck), even more than old men, who also are treated cautiously, since they may soon become “ghosts.” The existence of an “international” division of labor is, of course, presupposed before the development of a regular trade relation can begin. Such a division of labor exists much earlier and to a greater extent than is generally believed. “It is quite erroneous to suppose that the division of labor takes place only on a high scale of economic development. There are in the interior of Africa villages of iron-smiths, nay, of such as only turn out dart-knives; New Guinea has its villages of potters, North America its arrow-head makers.”[69] From such specialties there develops trade, whether through roving merchants, or by gifts to one’s hosts, or by peace-gifts from tribe to tribe. In North America, the Kaddu trade in bows. “Obsidian was universally employed for arrow heads and knives; on the Yellowstone, on the Snake River, in New Mexico, but especially in Mexico. Thence the precious article was distributed all over the entire country as far as Ohio and Tennessee, a distance of nearly two thousand miles.”[70] According to Vierkandt: “From the purely home-made products of primitive peoples, there results a system of trade totally distinct from that prevailing under modern conditions.... Each separate tribe has developed special aptitudes, leading to interexchange. Even among the comparatively uncivilized Indian tribes of South America, we find such differentiations.... By such a trade, products may be distributed over extraordinary distances, not in any direct way through professional traders, but through a gradual passing along from tribe to tribe. The origin of such a trade, as Buecher has shown, is to be traced back to the exchange of guest-gifts.”[71] Besides this exchange of guest-gifts, a trade may grow from the peace offerings which adversaries after a fight exchange as a sign of reconciliation. Sartorius reports on Polynesia: “After a war between different islands, the peace offerings for each group were something novel; and if the present and return present pleased both parties, a repetition took place, and thus again the way for exchange of products was opened. But, these, in contrast to guest-gifts, were the bases of continuing intercourse. Here, in place of the contact of individuals, tribes and peoples met. Women are the first object of barter; they form the connecting link between strange tribes, and according to evidence from many sources, women are exchanged for cattle.”[72]