positing of the snows which formed and main- 

 tained the glaciers that excavated these lake- 

 basins. As a result, much of the snow which fell 

 on the summit and its westerly slope was swept 

 across and deposited on the eastern slope, thus 

 producing on the eastern side deeper ice, more 

 glaciers, and more appreciable erosion from the 

 glaciers. The eastern summit of this range is 

 precipitous and is deeply cut by numerous ice- 

 worn cirques which extend at right angles to 

 the trend of this range. These cirques fre- 

 quently lie close together, separated by a thin 

 precipitous wall, or ridge. On the westerly side 

 of the range the upper slopes descend into the 

 lowlands through slopes and ridges rounded and 

 but little broken. Over these it is possible to 

 ride a horse to the summit, while foot travel and 

 careful climbing over precipitous rocky walls is 

 in most places required to gain the summit from 

 the east. 



Westerly winds still blow strongly, sometimes 

 for weeks, and the present scanty snowfall is 

 largely swept from the western slopes and de- 

 posited on the easterri side. So far as I know, 



