318 W. H. HUDLESTON, ESQ._, F.R.S.^ ON THE OEIGIN 



FIG. 1. 



:PLAN OF THE GRABEN SYSTEM AND ITS RELATION TO THE 

 CONGO BASIN. 



Eastern Arm. 

 1. Lake Stefanie. 



Western Arin. 

 7. Lake Albert. 



Kudolf. 



Baringo. 



Navaisha, 



Natron. 



Manyora. 



8. 

 9. 

 10. 



n. 



12. Lake Nyassa. 



Albert Edward. 

 Kivii. 



Tanganyika. 

 Rukwa. 



in this case are : (1) The existence of volcanic action within 

 the containing walls of the great western Graben. (2) The 

 fact that volcanic action is not extinct in this region, though it 



