576 



PROCEEDINGS OF THE ACADEMY OF 



[Dec, 



Table Showing Average Daily Motion of Plates on Asulkan Glacier 

 between July IS and July 23, 1906. 



Sketch Map of Tongue. — The accompanjang map of the glacier foot 

 has been compiled from a series of stadia measurements, sketches and 

 photographs. On it have been plotted the position of the tongue and 

 the outline of the ice as it existed on July 23, 1906. If question is 

 raised as to the accuracy of the stadia method for this class of work, it 

 may be noted that in every instance the motion of plates and recession 

 were determined from measurements with a standard tape, and it was 

 found that over rough ground and glacier surfaces work could be 

 greatly expedited by use of the stadia, with an error not so great as 

 would be encountered on the necessarily small scale of the plotting 

 map. 



Wenkchemna Glacier. 

 Valley of the Ten Peaks, Laggan, Alberta. 



In some respects this glacier presents the most unusual aspect of any 

 noted in the region. Of the piedmont type its neve receives snow 

 which falls and is blown across the Wenkchemna Group or ' ' The Ten 

 Peaks ' ' and falls into the couloirs and chimneys lying on the northern 

 slopes. At the lower levels a number of comparatively small glaciers 

 are formed, flowing almost due north across the southern half of the 

 Valley of the Ten Peaks. The valley bottom in places is covered with 

 an open forest of firs and spruces, the Lyell larch being found in abund- 

 ance at the upper (western) end where an elevation of over 7,000 feet 

 is reached. 



At the head of the valley several almost parallel lines of ancient 

 moraines were noted, and distinct traces of them could be followed 

 down the valley till they were finally lost in the stream-eroded bottom. 

 These moraines, and the very interesting one at the lower end of Moraine 

 Lake which has given it its existence and name, point clearly to the 



