GEOLOGY. 163 



data of this kind it is entirely impossible to 

 solve the interesting questions which underlie the 

 present distribution both of plants and animals. 



I do not intend to speak of the hrst section of 

 my journey across the ordinary caravan route from 

 Mombasa to Uganda, as Dr. Gregory has treated 

 this at great length in his paper (Proceedings 

 Geological Society, 1894). On my return to 

 England I handed to him all my collections, and 

 in what follows I am very greatly indebted to his 

 kind assistance. I hope that a paper, chiefly 

 written by him, will shortly appear in the Quar- 

 terly Journal of the Geological Society ; in this 

 my collection is most carefully and thoroughly 

 described. 



The geology of my journey admits of being 

 easily divided into the following districts : — 1. 

 The Victoria region. 2. Ruwenzori. 3. The 

 Central Watershed of Ankole, Karagwe, and East 

 Tanganyika. 



Of these, the Victoria region does not require a 

 very long description. It may be taken as ex- 

 tending from the Nandi range and Elgon probably 

 across the whole of Uganda westwards to Ruwen- 

 zori ; on the north it probably extends to the 

 Albert Nyanza ; on the south-east, considerably 

 beyond the Victoria Nyanza, though I have not 

 been able to obtain a definite idea as to how far 

 it extends south-east of it. The mouth of the 

 Kagera nearly limits its extent along the south- 



