﻿GLACIAL STUDIES IN CANADIAN ROCKIES 



475 



of the valley carried a different kind of load, presumably acquired 

 in a different manner. The rings of growth in the spruce and fir 

 of the Lake Louise region were found to average .884 mm. in thick- 

 ness, with a range of .51 to [.26 mm. in individual trees. The largesl 

 tree found growing upon the younger of the two block moraines 

 gave a circumference of 22\ cm. at a distance oi 50 cm. from the 

 base and should be approximately 400 years old. The largesl 

 spruce observed upon the older should be about 450 years old, 

 while one just on the outer edge must be approximately 580 years of 

 age. The last rings arc added with extreme slowness owing to the 



Fk 



:g. — Brook from Victoria glacier cascading over an old morai 

 detrital cone. 



relative reduction in leaf surface as the trees grow older, combined 

 with the short growing- season, the small amount of precipitation 

 and the various disadvantages attendant upon having to live in a 

 valley and especially one with a general north-south trend. 



II. WENKCHEMNA ( rLACIER 



i. General Data. — Nestling close in behind the northern base of 

 that grand array of peaks for which the Canadian Geographic Board 

 has recently adopted the name Wenkchemna Group, lies the Wenk- 

 chemna glacier. It occupies the southern half of the upper third 

 of the Valley of the Ten Teaks, facing north while the valley itself 



