154 



become greatly broken, by Lucia glacier, which was actively 

 advancing and was completely transformed by crevassing 

 during the summer of 1909, less strikingly by Hubbard 

 glacier, whose eastern margin had a slight advance in 1909, 

 and by Nunatak glacier, which had advanced 700 to 1 ,000 

 feet (200 to 300 m.) when visited by Martin [47] in 1910. 



Excursion C. 8. 



*' j m* tr ~ : 



The ice of Variegated glacier, covered with ablation moraine and small shrubs. 



The third test was a cessation of advance in those 

 glaciers that moved forward in 1906. With a sudden, 

 great addition of snow quickly terminated and followed 

 by a spasmodic advance of the glaciers thus supplied, it 

 would be expected that the wave of advance would soon 

 die out and the condition of stagnation return. This also 

 was predicted, and the observations of 1909 show clearly 

 that the prediction was correct, for all the advancing glaciers 

 of 1906 had returned to a condition of stagnation in 1909, 

 and the crevasses in the broken ice had been so healed by 

 ablation that it was once more possible to travel over the 

 glaciers though with far less ease than in 1905. Martin 

 [47] found that Lucia and Hubbard glaciers likewise had 



