We had now passed through, at the narrowest part, the hundred miles of depopulated country, of which about seventy are on the N.E. of Mataka. The native accounts differ as to the cause. Some say slave wars, and assert that the Makoa from the vicinity of Mozambique played an important part in them; others say famine; others that the people have moved to and beyond Nyassa.[18] Certain it is, from the potsherds strewed over the country, and the still remaining ridges on which beans, sorghum, maize, and cassava, were planted, that the departed population was prodigious. The Waiyau, who are now in the country, came from the other side of the Rovuma, and they probably supplanted the Manganja, an operation which we see going on at the present day. _4th August, 1866._--An hour and a half brought us to Miule, a village on the same level with Mbanga; and the chief pressing us to stay, on the plea of our sleeping two nights in the jungle, instead of one if we left early next morning, we consented. I asked him what had become of the very large iron-smelting population of this region; he said many had died of famine, others had fled to the west of Nyassa: the famine is the usual effect of slave wars, and much death is thereby caused--probably much more than by the journey to the coast. He had never heard any tradition of stone hatchets having been used, nor of stone spear-heads or arrowheads of that material, nor had he heard of any being turned up by the women in hoeing. The Makonde, as we saw, use wooden spears where iron is scarce. I saw wooden hoes used for tilling the soil in the Bechuana and Bataka countries, but never stone ones. In 1841 I saw a Bushwoman in the Cape Colony with a round stone and a hole through it; on being asked she showed me how it was used by inserting the top of a digging-stick into it, and digging a root. The stone was to give the stick weight. [Illustration.] The stones still used as anvils and sledge-hammers by many of the African smiths, when considered from their point of view, show sounder sense than if they were burdened with the great weights we use. They are unacquainted with the process of case-hardening, which, applied to certain parts of our anvils, gives them their usefulness, and an anvil of their soft iron would not do so well as a hard stone. It is true a small light one might be made, but let any one see how the hammers of their iron bevel over and round in the faces with a little work, and he will perceive that only a wild freak would induce any sensible native smith to make a mass equal to a sledge-hammer, and burden himself with a weight for what can be better performed by a stone. If people are settled, as on the coast, then they gladly use any mass of cast iron they may find, but never where, as in the interior, they have no certainty of remaining any length of time in one spot.