Soil is free. A family, however, may settle in a limited district, and claim it as theirs as long as they live there; or, leaving it temporarily, if they return after a reasonable time, they may still claim it. They temporarily mark their places by trees or stones, as boundary lines. But there is nothing permanent. They prove their right to it by residing on it or making a garden from time to time. But their claim may be lost if the entire family leave it and go elsewhere. Such a place being vacated, and some one else wishing to occupy it, permission may be granted on formal application to the king. But if an occupant has deserted a place, and no one else has applied for it, he can resume it as his even after the lapse of years. Dwellers on any ground have right to all the trees of fruitage on it, _e. g._, palm-nuts, and other natural wild edible nuts. Wells are never dug. People depend on springs and streams. Springs are free, even though they be on land claimed by others. A man assists his wife in the clearing of the forest for a garden plot; but she and her servants attend to the planting, weeding, and other working of the garden itself. 2. _Rights in Movables._ The tenant dweller on any particular lot of ground owns everything on it, except the ground itself. If a foreigner buy a piece of ground, he may or may not buy the houses, and so forth, according to agreement. The movables on any ground are houses, trees, and any vegetables planted. XI. EXCHANGE RELATIONS. There is no coin or metal currency, except among the coast tribes, where foreign governments have introduced it. Foreign trade-goods are everywhere the medium of purchase and exchange. But there is a sort of currency, in the shape of iron spear-heads and other forms resembling miniature hatchets, a certain number of which are given by interior tribes in the purchase of a wife. They are used only for this purpose, and are exchanged by the parties themselves for the foreign goods required in the dowry. They are manufactured by any village blacksmith from imported iron. They are not received or recognized by white traders. Formerly cowry shells were used, even by foreign traders, as a currency; and they are still so used in the Sudan. But in all coast tribes purchase and sale are effected by foreign-made calico prints, pottery, cutlery, guns, powder, rum, and a great variety of other goods. The natural products of the country--ivory, rubber, palm-oil, dyewoods--and many other native unmanufactured articles are exchanged for these goods. The natural products belong to the men. If a woman should find ivory, she cannot sell it; it belongs to her husband to barter it.