PRINCETON, N. J., June i, 1879. 



SIR : We transmit herewith the reports upon Topography, Meteorology, 

 and Hypsometry, as prepared by Messrs. William Libbey, Jr., and W. W. 

 McDonald, of the Scientific Expedition which went out in the summer of 1877 

 under our charge. 



Together with the reports are three maps : the first containing the results 

 of a topographical reconnaissance in the valley of Smith's Fork, in the Uintah 

 Mountains of Utah ; the second containing the triangulation of the same ; the 

 third showing the relation between Fort Bridger and the valley of Smith's 

 Fork. 



The topographical report is divided into two parts, one devoted to the work 

 in Colorado, the other to that in Utah. 



The meteorological report is confined wholly to Utah, and contains a mete- 

 orological record for part of the time spent there. 



The hypsometric report is also divided into a report of the work in Colo- 

 rado, then of that in Utah, and these are followed by a discussion of the baro- 

 metric work. Yours, etc., 



C. F. BRACKETT. 



JOSEPH KARGE. 

 DR. A. GUYOT, 



Director of the E. M. Museum. 



