The date of the Bantu migrations is much disputed. "As far as linguistic evidence goes," says H. H. Johnston[235], "the ancestors of the Bantu dwelt in some region like the Bahr-al-Ghazal, not far from the Mountain Nile on the east, from Kordofan on the north, or the Benue and Chad basins on the west. Their first great movement of expansion seems to have been eastward, and to have established them (possibly with a guiding aristocracy of Hamitic origin) in the region between Mount Elgon, the Northern Victoria Nyanza, Tanganyika, and the Congo Forest. At some such period as about 300 B.C. their far-reaching invasion of Central and South Africa seems to have begun." The date is fixed by the date of the introduction of the fowl from Nile-land, since the root word for fowl is the same almost throughout Bantu Africa, "obviously related to the Persian words for fowl, yet quite unrelated to the Semitic terms, or to those used by the Kushites of Eastern Africa." F. Stuhlmann, on the contrary, places the migrations practically in geological times. After bringing the Sudan Negroes from South Asia at the end of the Tertiary or beginning of the Pleistocene (_Pluvialperiod_), and the Proto-Hamites from a region probably somewhat further to the north and west of the former, he continues: From the mingling of the Negroes and the Proto-Hamites were formed, probably in East Africa, the Bantu languages and the Bantu peoples, who wandered thence south and west. The wanderings began in the latter part of the Pleistocene period[236]. He quotes Th. Arldt, who with greater precision places the occupation of Africa by the Negroes in the Riss period (300,000 years ago) and that of the Hamites in the Mousterian period (30,000 to 50,000 years ago)[237]. All these peoples resulting from the crossings of Negroes with Hamites now speak various forms of the same organic Bantu mother-tongue. But this linguistic uniformity is strictly analogous to that now prevailing amongst the multifarious peoples of Aryan speech in Eurasia, and is due to analogous causes--the diffusion in extremely remote times of a mixed Hamito-Negro people of Bantu speech in Africa south of the equator. It might perhaps be objected that the present Ba-Hima pastors are of Hamitic speech, because we know from Stanley that the late king M'tesa of Buganda was proud of his Galla ancestors, whose language he still spoke as his mother-tongue. But he also spoke Luganda, and every echo of Galla speech has already died out amongst most of the Ba-Hima communities in the equatorial regions. So it was with what I may call the "Proto-Ba-Himas," the first conquering Galla tribes, Schuver's and Decle's "aristocracy," who were gradually blended with the aborigines in a new and superior nationality of Bantu speech, because "there are many mixed races, ... but there are no mixed languages[238]."