SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE SHERZER. 



PLATE XVI. 



FIG. I. Formation of Forbes's "dirt bands," Deville Glacier, Selkirk*. From summit of Mt. Fox (10,572 feet), 

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



FIG. 2. Forbes's "dirt bands," Victoria Glacier. Photographed from the Lefroy Glacier, July, 11)04. Often confused 



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



