PKEFACE. 



It is a pleasure as well as a duty to begin this 

 work by an attempt to show the indebtedness of 

 which I am fully conscious to the many who have 

 assisted me directly and indirectly in the prepara- 

 tion of this work. 



If it had not been for the care and hospitality of 

 Captain Gibb, the French Fathers in Buddu and 

 on Tanganyika, Mr. Law, Mr. Heard, and the late 

 Dr. Scott in British Central Africa, I should cer- 

 tainly not have survived the expedition. 



In the preparation of it, I must express my 

 thanks first to Mr. A. D. Innes for the numerous 

 suggestions and revisions that have shaped my 

 rough-hewn manuscripts. Dr. Gregory should 

 have the credit of much of the geological por- 

 tion, and Mr. Butler and Mr. Murray have given 

 me two lists which are now printed in the 

 Appendix. 



In the preparation of the illustrations, I have 

 to thank first Mr. J. Thomson, to whose ex- 



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