EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM TIIE MISSISSIPPI RIVER TO THE PACIFIC OCEAN, 
WAR DEPARTMENT. 
ROUTE NEAR THE 38tii AND 39th PARALLELS, EXPLORED BY CAPTAIN J. W. GUNNISON, AND NEAR THE 41st 
PARALLEL, EXPLORED BY LIEUTENANT E. G. BECKWITH. 
ZOOLOGICAL REPORT . 1 
WASHINGTON, D. C. 
18 5 7 . 
The report to which the present article belongs will be found in Vol. II of the series. 
