SNOW-MUSHROOMS AND CAHOTS 215 



of 2 feet. Upon their circular table-tops the 

 snow collects. When the tree-stump is shorter the 

 cap appears as a boss projecting above the general 

 surface. In such cases there is a hidden cave 

 beneath, into which one may easily fall, and from 

 which it is difficult to get out when hampered 

 by snowshoes (Fig. 28). The moist air from 

 the Pacific Ocean, rising to the summits of the 



Fig 28 



Snow Mushroom with hollow beneath, 

 from a photograph. 



Selkirk Range, which attain an elevation of about 

 10,000 feet, deposits a vast amount of snow. On 

 February 4, 1901, the registered snowfall for the 

 winter already amounted to 25 feet, although this 

 had packed on the ground to a total thickness of 

 5 feet. The atmosphere of the valley at Glacier 

 House is very still, and there is no drifting. The 

 snowfalls are often very rapid, sometimes as much 



