SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE— SHERZER. 

 Mt. Donkin and Asulkan Pass. 



Leda. 



PLATE XXXIX. 

 Pollux. Castor. 



IgT"^ 



Fig. I.— General view of Asulkan Glacier iii 1902. Copyrighted, 1902, by the Detroit I'liotographic Co. 

 nontin. Castor and Pollux. Dome. P,onney. 



Fig. 2. — The Asulkan glaciers and siiowfields from Avalanche Mt. (elevation 9,387 



feet), showing a decadent piedmont glacier. Photographed in 



1901 by Arthur O. Wheeler. 



