The stone axe was also prominent in interpersonal relations. Yir Yoront men were dependent upon interpersonal relations for their stone axe heads, since the flat, geologically–recent, alluvial country over which they range provides no suitable stone for this purpose. The stone they use came from quarries for hundred miles to the south reaching the Yir Yoront through long lines of male trading partners. Some of these chains terminated with the Yir Yoront men, others extended on farther north to other groups, using Yir Yoront men as links. Almost every older adult man had one or more regular trading partners, some to the north some to the south. He provided his partner or partners in the south with surplus spears, particularly fighting spears tipped with the barbed spines of a sting ray which snap into vicious fragments when they penetrate human flesh. For a dozen such spears, some of which he may have obtained from a partner the north, he would receive one stone axe head. Studies has shown that the sting ray barb spears increased in value as they move south and farther from the sea. One hundred and fifty miles south of Yir Yoront one such spear may be exchanged one stone axe head. Although actual investigations could not made, it was presumed that farther south, nearer the quarries one sting ray barb spear would bring several stone axe heads Apparently people who acted as links in the middle of the chain and who made neither spears nor axe heads would receive certain number of each as a middleman’s profile. Thus trading relations, which may extend the individual personal relationships beyond that of his own group, were associated with spears and axes, two of the most important items in a man’s equipment. Finally most of the exchanges took place during the dry season, at the time of the great aboriginal celebrations centering about initiation rites or other totemic ceremonies which attracted hundreds and were the occasion for much exciting activity in addition to trading. Returning to the Yir Yoront, we find that adult men kept axes in camp with their other equipment, or carried them when travelling.