M. Clozel, who regards them as mentally and morally superior to most of the Middle and Lower Congo tribes, tells us that the Bayas, that is, the "Red People," came at an unknown period from the east, "yielding to that great movement of migration by which the African populations are continually impelled westwards." The Yangere section were still on the move some twelve years ago, but the general migration has since been arrested by the Fulahs of Adamawa. Human flesh is now interdicted to the women; they have domesticated the sheep, goat, and dog, and believe in a supreme being called _So_, whose powers are manifested in the dense woodlands, while minor deities preside over the village and the hut, that is, the whole community and each separate family group. Thus both their religious and political systems present a certain completeness, which recalls those prevalent amongst the semi-civilised peoples of the equatorial lake region, and is evidently due to the same cause--long contact or association with a race of higher culture and intelligence. In order to understand all these relations, as well as the general constitution of the Bantu populations, we have to consider that the already-described Black Zone, running from the Atlantic seaboard eastwards, has for countless generations been almost everywhere arrested north of the equator by the White Nile. Probably since the close of the Old Stone Age the whole of the region between the main stream and the Red Sea, and from the equator north to the Mediterranean, has formed an integral part of the Hamitic domain, encroached upon in prehistoric times by Semites and others in Egypt and Abyssinia, and in historic times chiefly by Semites (Arabs) in Egypt, Upper Nubia, Senaar, and Somaliland. Between this region and Africa south of the equator there are no serious physical obstructions of any kind, whereas farther west the Hamitic Saharan nomads were everywhere barred access to the south by the broad, thickly-peopled plateaux of the Sudanese Black Zone. All encroachments on this side necessarily resulted in absorption in the multitudinous Negro populations of Central Sudan, with the modifications of the physical and mental characters which are now presented by the Kanuri, Hausas, Songhai and other Negroid nations of that region, and are at present actually in progress amongst the conquering Fulah Hamites scattered in small dominant groups over a great part of Sudan from Senegambia to Wadai.