THE TANGANYIKA PROBLEM. 
IOI 
mann’s* view that the range was the expression of a double 
line of faulting, or was in reality a block mountain, is not 
altogether correct. Indeed, Stuhlmann did not acquire a 
sufficiently extensive acquaintance with the range in order 
to grasp its real nature, but his view was a distinct advance 
upon Stairs’ suggestion that the mountains were the denuded 
fragments of an old volcanic cone. Unquestionably, Stuhl- 
mann’s was a very shrewd guess at the nature of the 
mountains which confronted him, and, from his points of 
observation, perhaps the only supposition he could make. 
Scott Elliot appreciated the existence of the up-piled 
schists on both sides of the range, but his theory that 
the mountains are a sort of oval boss of raised material, 
independent of the surrounding geological features, cannot 
be made to fit in with the actual facts of the case. The 
range, as we have seen, seems in reality to be merely an 
accentuated expression of the same sort of up-push as that 
which has raised the eastern wall of the eurycolpic folds 
north and south of it. What has happened appearing 
to be that over this more actively raised region the lower 
materials, which underlay the sides of the depression, have 
been pushed through the surface in a succession of pro- 
truding, lenticular masses, the axes of which run north 
and south. The amphibolites, as I have found myself, 
do actually run out in this way towards the north of the 
range. 
Although I have in the above briefly outlined the most 
important structural features of the Mountains of the 
Moon, it is necessary to refer to certain other matters in 
connection with them at the present time. Before my 
visit to the range, in March, 1900, no one had reached 
the snow-line on these mountains, and consequently 
* Stuhlmann. Mit Emin I’acha, 
