THE GLACIER OF MOUNT LYELL, CALIFORNIA 361 



then appeared above the surface, are now covered. A comparison 

 of Mr. Gilbert's photographs of the western lobe with the writer's, 

 taken only one year later, indicates an increase which can be detected 

 from the photographs. For example, in Fig. 1 it will be noted that 

 the snow near the top of the peak above the Bergschrund is con- 

 tinuous to the top. In Gilbert's photograph, taken only one year 



Fig. 2. — Lyell Glacier — eastern lobe. 



earlier, a continuous line of rock appears across the arm above the 

 Bergschrund. It is very evident, from the clothing of new snow 

 remaining on the glacier through the summer, that the snowfall of 

 last winter has increased the volume of the glacier. It is evident, 

 from the relation of the ice to the moraines, and from the records 

 above quoted, that little or no recession has occurred in recent 

 years. The relation of the morainal front to the underlying rock at 

 the eastern lobe, and the large accumulations of extra-morainal snow 

 in the western lobe, suggest that the glacier may be slowly advancing. 

 It may be confidently stated that for the past twenty-one years there 



