230 



EASTERN ETHIOPIA 



The sciuthei-u extremity of the western arm was 

 investigated l)y Burton and Speke, who discovered Lake 

 Tanganyika (1858), and Lake Nyasa by Livingstone 

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

 investigated by Moore and especially Lake Tanganyika 

 (1896 and 1899). 



A. 



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Lohdia ]Vol/asfoui. 

 Lolielia ground on Mount RuAvenzori. (From a pliotograpli by 

 Dr. A. 1"'. R. Wollaston, Jonrnal of the Linnean Society, 

 1908, xx.xviii, PI. xvii, Fig. 7.) 



Lake Tanganyika is tlie longest Lake in the world ; it 

 measures 420 miles in length, its breadth varies from 30 

 to 50 miles. Li 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 



