Letters to a Friend 



the glacier and stake No. [ ]. Its motion I 

 found to be in 46 days 40 inches. 



Thus these ice-masses are seen to possess the 

 true glacial motion. Their surfaces are striped 

 with bent dirt bands. Their surfaces are bulged 

 and undulated by inequalities in the bottom of 

 their basins, causing an upward and downward 

 swedging corresponding to the horizontal swedg- 

 ing as indicated by the curved dirt bands. 



The McClure Glacier is about half a mile in 

 length and about the same in width at the 

 broadest place. It is crevassed on the south 

 east corner. The crevass runs about southwest 

 and northeast and is several hundred yards in 

 length. Its width is nowhere more than one 

 foot. 



The Mt. Lyell Glacier, separated from that 

 of McClure by a narrow crest, is about a mile 

 in width by a mile in length. 



I have planted stakes in the glacier of Red 

 Mountains also but have not yet observed 

 them. 



[ 142] 



