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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[vol. 47 



water (fig. 81) which seems to fluctuate but little during the clay, 

 i ir from day to day. The volume was estimated at about 90 cu. ft. a 

 second and its temperature, during all hours of the day, ranged from 

 35 to 36 F. Less than a mile below, this stream enters Moraine 

 Lake (pi. lxvii) where there is not even the suggestion of a delta, 

 showing that the glacier is not only not eroding its bed now but that 

 it has not done so for centuries. The temperature of the water and 



Fk;. 81. — Drainage stream from Wenkchemna glacier. 



the regularity of its flow indicates that it is derived, to a considerable 

 extent, from some source other than that of the melting of the glacier 

 itself, such as the small side streams which enter the glacier and the 

 drainage from Wenkchemna Lake (fig. 83). It is evident from the 

 above data that we have here an exceptionally indifferent mass of 

 ice and can understand how a glacier of such magnitude may be 

 maintained by such a relatively small neve area. The key to the 

 situation is the high walklike cliff which here has an east-west trend, 

 entirely across the glacier, which not only shields the neve and ad- 



