784 



ISRAEL C. RUSSELL 



about twenty-six feet high, and is composed of the edges of 

 layers of clean, stratified, granular snow, between which there are 

 dirt bands ranging in thickness from a fraction of an inch to three 

 or four inches. On the central part of the precipice, where fully 

 exposed to the sun until noon each day, there are two conspicu- 

 ous cornices which project beyond the surface below them in 

 each instance from six to seven inches. The under surfaces of 



Fig. I. — Wall of a crevasse in the neve portion of one of the glaciers on the Three 

 Sisters, Oregon, showing cornices above dirt bands. Looking northwest. August 

 i6, 1903. 



the projecting beds, where exposed, are slightly fluted at right 

 angles to their length, but this is not a conspicuous feature. The 

 precipice at its north end passes under an arch of snow which 

 forms the roof of a cavern, and in the portion sheltered from the 

 sun there is no jutting of the layer of snow above the lower of 

 the two principal dirt banks, which is the only one extending 

 into the cavern. Near the south end of the precipice, but not 

 shown on the accompanying picture, the dirt bands are bent 

 abruptly upward and become vertical, near where the neve joins 

 the steep face of the mountain. In this portion of the precipice. 



