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EASTERN ETHIOPIA 



XVIII 



The southern extremity of the western arm was 

 investigated by Burton and Spoke, who discovered Lake 

 Tanganyika (1858), and Lake Nyasa by Livingstone 

 (1859). The western lake-chain has been carefully 

 investigated by Moore and especially Lake Tanganyika 

 (1896 and 1899). 



Lobelia Wollantoid. 



Lobelia ground on Mount Ruwenzori. (From a photograph by 

 Dr. A. F. R. Wollaston, Journal of the Linnean Society, 

 1908, xxxviii, PI. xvii, Fig. 7.) 



Lake Tanganyika is the longest lake in the world ; it 

 measures 420 miles in length, its breadth varies from 30 

 to 50 miles. In some parts it is very deep. This 

 enormous rocky cistern is formed by the subsidence of a 

 long narrow tract of country, and the surrounding 



