EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO THE PACIFIC OCEAN. 
WAR DEPARTMENT. 
REPORT ; 
ON THE 
BOTANY OF THE EXPEDITION: 
JOHN TORREY AND ASA GRAY. 
ROUTE ON THE FORTY-FIRST PARALLEL OF NORTH LATITUDE, UNDER THE COMMAND OF LIEUT, E. G. 
" BECKWITH, THIRD ARTILLERY; i 
AND 
; ` ROUTE NEAR THE THIRTY-EIGHTH AND THIRTY-NINTH PARALLELS OF NORTH LATITUDE, UNDER THE 
COMMAND OF CAPT. J. W. GUNNISON, CORPS OF TOPOGRAPHICAL ENGINEERS. 
