N. M. FENNEMAN 



Crevasses. — A second great advantage from the recent defi- 

 ciency of snowfall and the excess of melting was found in the 

 complete uncovering of crevasses. No part of the glacieris free 



Fig 



-Crevasse, open about 10 feet. 



from cracks, but near the middle a greater steepness of the bed 

 gives rise to crevassing on a large scale (Figs. 4 and 5). 

 The slope of the ice surface for some distance at this place was 



