32 JUNIUS HENDERSON 



beneath the ice at the upper edge of the lake loaded with rock 

 flour, and rises milky white abruptly through the clearer water 

 gathered from the surface, forming a striking feature not found 

 there in 1902, when, if it found its way into the lake at all, it was 

 so diluted before reaching the surface that it did not attract 

 attention. 



As would be expected from the deepening of the drainage 

 valley leading into the lake, by vertical erosion, and the increase 

 in its width by lateral erosion and melting, the area of the lake 

 is much greater than in 1902, just as its area in 1902 was appar- 

 ently greater than when examined by Professor Lee in the summer 

 of 1900. 



Another noteworthy fact is that almost the entire front of the 

 glacier was steeper in 1903 than in 1902, upon which subject 

 more data and accurate measurements seem necessary before a 

 satisfactory reason may be assigned for the change. 



Although the rate of flow for this glacier is unknown, it must 

 surely be so slow as to require several years of normal or exces- 

 sive precipitation or low temperature for its down-stream 

 extension to recover from the effects of rapid waste during a 

 series of warm, dry seasons. 



An analysis of the records of the Denver, Boulder, Sugar 

 Loaf, Moraine, and Long's Peak stations, as shown by the 

 monthly statements of Mr. F. H. Brandenburg, Denver forecast 

 pfificial and section director of the Weather Bureau, indicates 

 that from September i, 1901, to September i, 1902, the precipi- 

 tation was far below normal and the average temperature was 

 much above normal. On the other hand, from September i, 

 1902 to September i, 1903, precipitation was considerably above 

 normal and average temperature was much below normal. The 

 highest of these stations is only 8,500 feet above sea-level, and 

 the nearest is about ten miles distant, so the figures given for the 

 stations would not exactly apply to the glacier, the altitude of 

 which is about 13,000 feet; but the fact that all the stations 

 record greater precipitation and lower temperature for the latter 

 period than for the former period makes it appear exceedingly 

 probable that the same condition would have been shown if a rec- 



