LAK.ES. 
239 
through it, and where there is not sufficient inclina- 
tion to throw it off. 
2. Corrie lakes may be thus explained. Let us 
assume a slope (Fig. 64, a, b, c, d) on which snow 
and ice ( e ) accumulates. 
The rocks and fragments falling from the heights 
would accummulate at d. Moreover, the ice would 
tend to form a hollow at c (Fig. 65) where the 
pressure would be greatest. 
If subsequently the snow and ice melted, water 
would accumulate in the hollow (Fig. 66), and lakes 
thus formed are common in mountainous districts, 
where they have a special name— Corries in Scot- 
land, Oules in the Pyrennees, Botn in Norway, Kar- 
wannen in the German Alps, etc. 
3. A third class of lakes is that due to river val- 
