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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[vol. 47 



beyond the Vaux line and still plowing into ground moraine, indicat- 

 ing a very slight change for the entire year. 



3. Drainage. — The drainage from the two ice streams is not 

 strong, but more turbid than either the Illecillewaet or the Wapta, 

 indicating a greater relative amount of subglacial erosion. From 

 the main Asulkan two streams issue, one upon either side of the 

 nose, fluctuating some from day to day and during the day itself. 

 This fact, as well as the temperatures averaging 32. y° F. and 32. 2° 



Fig. 



-Left Asulkan moraine shedding its rocky covering and exposing the 

 ice core. East side. 



F., would indicate that this water is derived almost entirely from the 

 melting of the ice. 



4. Morainic Core. — It is difficult for the ordinary visitor to be- 

 lieve that the high, sharply crested embankments, lying parallel with 

 the main axis or sides of the glacier, are in reality ice ridges with 

 only a comparatively thin dressing of rock fragments. The left 

 lateral of the Asulkan is showing, in a most interesting manner, the 

 real structure of such a moraine and the passage from a single ridge 

 into a double one. About a quarter of a mile back from its lower 

 end it lie-ins to shed its rock cover, the debris sliding down and 

 forming a ridge upon either side. The eastern side is not completely 



