Formation and General Features of Ruwenzori. 
The snow-limit may be calculated as between 14,700 and 
14,800 feet; in other words, at about the same level which 
is reached by the lower extremity of most glaciers. Towards 
14,000 feet the rain always turns into snow. 
There is not, perhaps, an absolute predominance of any one 
wind throughout the chain. It is, at least, cpiite certain that 
fog, snow, and hail are extremely frequent and common to all 
the winds, so that all forecasts are vain. Fine and bad weather 
may alternate several times in a few hours, and in so capricious 
a manner as not to appear subject to any law. Only in the 
early morning hours there seems to be a somewhat greater 
probability of a clear sky. 
The bad weather is frequently violent, and accompanied by 
strong wind, lightning and thunder, even in the highest 
regions. Near Alexandra Peak and on Edward and Sella 
Peaks the rocks bear witness to the violence of these storms 
by the innumerable fulgurites with which they are riddled. 
No conclusions as to the best season for visiting Ruwenzori 
can be drawn from the experiences of the Italian expedition. 
During June bad weather certainly predominated. The longest 
dry spell was in the second week of July. After this period 
the expedition began to withdraw from the higher valleys and 
peaks, to which the rains and fogs seem to be strictly limited. 
Indeed, on their return to Fort Portal they learned from the 
resident missionaries that during those two months no rain 
had fallen there. 
The valleys of Ruwenzori are often divided into natural 
terraces produced by the formation of layers of strata above 
the ridges of hard rock, which at an earlier period dammed up 
these valleys in places, thus creating lake basins which have 
subsequently silted up with alluvial deposit, of which the 
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