NOTE ON REFERENCES 



THE bibliography, which is intended to be representative rather 

 than comprehensive, is arranged at the end of the volume 

 under chapter headings. Thus it can be used either in connection 

 with the text or independently as an indication of the more im- 

 portant literature available on each subject. Reference in the 

 text is made by author (or source of origin when anonymous) and 

 date according to the system usually adopted in scientific literature. 

 Details of the system are explained in a note on p. 614, preceding 

 the bibliography. 



The African Research Survey is deeply indebted to the Librar- 

 ians at many Institutions for answering queries, lending material, 

 and giving facilities for reference. 



