ACCOUNT

OF AN

EXPEDITION

FROM PITTSBURGH

TO

THE ROCKY MOUNTAINS,

PERFORMED

IN THE YEARS 1819, 1820.

BY ORDER OF THE

HON. J. C. CALHOUN, SECRETARY OF War,

UNDER THE COMMAND OF

MAJ. S. H. LONG, OF THE U. S. TOP. ENGINEERS.

COMPILED

FROM THE NOTES OF MAJOR LONG, MR. T. SAY,

AND OTHER GENTLEMEN OF THE PARTY,

BY EDWIN JAMES,

BOTANIST AND GEOLOGIST TO THE EXPEDITION.

IN THREE VOLUMES.

VOL. I.

LONDON:

PRINTED FOR

LONGMAN, HURST, REES, ORME, AND BROWN,

PATERNOSTER-ROW.