SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE— SHERZER. 



PLATE XIX. 







Fig. I. — Boulder mouiul, Weiikcliemna GlaL-ier, illubtratiiig the protective effect of rocky debris. Estimated to be 



eighty feet in height. 



Whyte, Devil's Thumb. 



Bow Valley. 





Fig. 2. — Surface lakelet, Victoria Cdacier, resulting from lack of debris protection. Enlargement towards right is still 

 in progress liy melting, but has jiractically ceased towards the left, owing to the rocky cover. 



