HYPSOMETRICAL REPORT. 



I. COLORADO. 



OUR hypsometric work was entirely done by means of 

 mercurial barometers. In Colorado this was done very hur- 

 riedly as to time, but not as to carefulness. We measured 

 Pike's Peak, Mt. Lincoln, Mt. Bross, Mt. Silverheels, Mt. 

 Quandary, Mt. Princeton, Mt. Gray, and Mt. Evans, with 

 very fair results, as will be seen by the comparison which we 

 make with the heights of these same peaks as given by other 

 observers. We give this comparison in a tabular form, with 

 the height of the two bases measured by us, as well as their 

 heights as given by others : 



* Wr., Wheeler. Wy., Whitney. 



t U. S. Signal Service. 



In many cases our measurements vary no more than ten 

 feet either way from the others, and this small difference is to 

 be considered as of no importance in such a height, as it 

 would seem like disputing about the thousandth of an inch in 

 a man's measurement. 



Where no base is mentioned in the above table, we used 

 the place nearest the mountain that we wished to measure ; 

 obtaining its height by corresponding observation between 

 it and some other place whose height was already known. 

 For example, we obtained the height of our barometer in 



