Abstract
BY THE fifth millennium B.C. Neolithic peasants had occupied the lower Nile and were pushing westwards along the Mediterranean seaboard into the Sahara and southwards up the river to the Sudan. During the three succeeding millennia the new economy spread throughout northern Africa but it is not until the first few years of the present era that there is any reliable evidence of mixed farming communities in the central and southern parts of the Continent south of the Sahara.
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