Serology and the History of the Northern Nilotes

It frequently happens that the only information available on interrelationships and former movements of African peoples lies in their oral traditions and myths. In the myths it is difficult to disentangle symbolic from historical events and personalities, while, fascinating though it is to listen to an old man recounting the movements of his ‘ancestors’ countless generations earlier, one frequently wishes that there were some independent line of evidence against which his statements could be checked. Such an independent line of evidence is provided by the steadily accumulating data on the genetic Constitution of African peoples. The Nilotes provide an illustration of its usefulness, of its limitations, of the type of additional information required to extract the maximum from the data, and of the postulates necessary to do so.