Ill J. TANGANYIKA PROBLEM. 41 



encountered a succession of rising granitoid ridges and 

 elevations, which finally culminate in the huge mountains 

 forming the east coast of Lake Nyassa, these mountains 

 .g in fact the last and highest of a succession 

 of granitoid ridg< of varying 



depth and extent. The trend of the ridges is from 

 north to south, and the valley in which I lies 



is the broadest, and the est, which we h 



1 during our supposed : from the 



-.sing the valley of the lake toward 

 Kota, we find that it sinks to. and below tin of 



the sea, and then we pass up again over the alluvial 



