EXTINCT AND EXISTING GLACIERS OF COLORADO 67 



The' use of stakes is not the best method for accuracy, and in order 

 to get accurate results the observations should be carried on for 

 quite a number of days or weeks. However, the rate given, when 

 compared with that of similar ice-masses, considering the time of the 

 year, is not abnormal and may be quite accurate. 



Andrew Glacier. — This ice-field is located on Mills's map just south 

 of Mt. Hallett and about five miles northwest of Long's Peak. I have 

 no other information concerning it. 



Tyndall Glacier. — Chapin' described this ice-field without naming 

 it. Mills informs me that it now passes under the foregoing title. 

 It is between Mt. Hallett and Flat Top (Chapin's "Table Mountain '.') . 

 Chapin says: 



It hangs like a true glacier to a steep ridge connecting the peak with Table 



Mountain [p. 72] There were no actual crevasses, but the snowwas ridged 



and serrated. The center of the field seemed to be solid ice, and there was a 



miniature hergschrund next the upper rocks bordering on the ice [p. 86] 



The snow fills an amphitheater over a quarter of a mile in width at the lower rim, 

 with walls a thousand feet high. The general slope is northeast. The position 

 in width is northwest to northeast. A magnificent terminal moraine locks in the 

 ice, and the meltings from the snow escape under the rocks of the moraine at least 



fifty feet below the top The greater part of the moraine was undoubtedly 



formed when the body of the snow was much greater than it is now, not in area, 

 but in depth; yet I think the work of carrying down stones is still going on [p. 89]. 



He made the mistake of trying to measure the rate of movement by 

 driving stakes into the ice, which, of course, instead of settling with the 

 melting of the ice, simply melted out and were found lying on the 

 surface upon the next visit, so that the results are entirely worthless 

 (pp. 90-93)- 



Sprague Glacier. — On September 23, 1905, Mr. Enos A. Mills, 

 wrote in answer to my inquiry: "I was there ten years ago and esti- 

 mated its height [length] at eleven hundred feet, and its width at 

 fourteen hundred. Its slope is much steeper than that of Hallett 

 Glacier. My barometer showed its bottom to be just twelve thousand 

 feet above sea level." It is southwest of what is now called Stone's 

 Peak, about twelve miles west of Estes Park postoffice. 



' Chapin, Frederick H., Mountaineering in Colorado, W. B. Clarke & Co., Boston, pp. 69-96, 3d ed., 1893. 



