736. 



I. H. OGILVIE 



slope is steep; its surface clean and much crevassed; its front, 

 though steep, does not exhibit a cliff. 



No records are available as to its rate of motion, but a rapid retreat 

 is evident. Drift material, free of vegetation, is to be found for about 

 three-quarters of a mile from the ice and extending 300 feet up the 

 sides of the valley. The ice descends to a level of 5,000 feet (aneroid). 



Fig. 10. — Wapta glacier. 



Fed by the same snow-field is another glacier which descends the 

 valley above Twin Falls. This valley is flat and open, the glacier 

 having less slope than the Wapta, and for some reason which is not 

 evident the ice-front does not descend below 5,700 feet. A recent 

 rapid retreat is evident, but the exact amount could not be deter- 

 mined, since fresh landslides have brought down much material 

 which has been mingled with the drift, while both drift and talus are 

 being worked- over by the glacial stream. 



The Illecilkwaet glacier. — Probably the most famous and most 

 often visited glacier in British North America is the Illecillewaet, or 



