ABSTRACT
Apart from the published sources used in the preparation of this Survey, to the authors of which our thanks are due, I am indebted to an unpublished English version of Paulitschke's Ethnographie Nordost-Afrikas by Miss Cory, of which I have made some use. I have discussed the subject, especially in its linguistic aspect, with Professor Tucker and Mr. B. W. Andrzejewski; and I have also had the advantage of discussing tribal distribution and other matters with Professor V. L. Grottanelli of the Museo Preistorico-Etnografico, Rome, and with Father M. Borello of the Consolata Mission. I should also like to thank Miss Barbara Pym of the International African Institute for much careful and painstaking help.
