SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE--SHERZER. 



PLATE XVI. 



Fig. I. — Formation of Furbes's "dirt bands," Deville Glacier, Selkirks. From summit of Mt. I''o.\ (10,572 feet), 

 looking eastward. Photographed, 1902, by Arthur O. Wheeler. 



tlG. 2. — Forbes's " dirt bands," Victoria Glacier. Photographed from the Lefioy Glacier, July, Iyu4. Often confused 



with "dirt zones." Compare figure 2, plate XI. 



