This massive work, the result of five years' intensive labor by Lord Hailey and his staff, will long stand as a landmark in African studies. Hailey has taken all Africa south of the Sahara for his province, and within this vast area covers all the main problems -- geographic, anthropological, political, economic and social. Yet comprehensive as the book is, it is not a mere encyclopedia, for every effort has been made to synthesize the data and to make careful comparisons. There is an excellent index. A useful criticism of this great work will be found in the series of reviews by competent authorities prepared for the Royal African Society and published by Macmillan (2/-).