J. W. Gregory 
Great Rift Valley [PDF ebook] 
Being the Narrative of a Journey to Mount Kenya and Lake Baringo; With Some Account of the Geology, Natural History, Anthropology and Future Prospects of British East Africa

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Dr. H. R. Mill has remarked (knowledge, Jan. 1896, p. 2) that in pioneer exploration England has led the way, but that in scientific geography we have always been beaten by our German rivals. The history of the exploration of Equatorial Africa is one to which Englishmen can look back with feelings of such just pride, that we may ungrudgingly admit the superiority of German scientific work in this region.