Rocky Mountains. 165 



tract will show to what objects they were instructed to direct 

 their attention. 



" Mr. Say will have every facility afforded him that cir- 

 cumstances will admit, to examine the country, visit the 

 neighbouring Indians, procure animals, &c. for the attain- 

 ment of which, he will call on Lt. Graham, who is authoriz- 

 ed to make any expenditures in behalf of the expedition, that 

 may be deemed reasonable and necessary, and afford any aid 

 in his power, consistent with the performance of other duties. 

 Mr. Seymour, or Mr. Peale will accompany him, whenever 

 their services are deemed requisite. 



" Maj. O'Fallon has given permission to Mr. Dougherty to 

 aid the gentlemen of the party, in acquiring information con- 

 cerning the Indians, &c; this gentleman will, therefore, be 

 consulted in relation to visits, and all' kinds of intercourse 

 with the Indians, that may be necessary in the prosecution of 

 the duties of the expedition. 



" In regard to these duties, the gentlemen of the expedition 

 will consult my orders of March last. The documents trans- 

 mitted from the Philosophical Society of Philadelphia, by 

 the Secretary of War; and the instructions of Mr. Jefferson 

 to Capt. Lewis, to be found in vol. 1st of Lewis and Clark's 

 expedition, and regulate their observations and inquiries ac- 

 cordingly. 



" Lt. Graham will embrace every opportunity for celestial 

 and barometric observations, and calculate the latitude, lon- 

 gitude, magnetic dip and variation, with the utmost at- 

 tainable precision; also the heights of the neighbouring hills, 

 and the adjacent high table lands. He will also continue the 

 meteorologic observations as usual, noticing the changes of 

 weather, and all celestial and atmospheric phenomena. To 

 aid him in these duties, he will call on Lieut. Swift, or any 

 other gentleman of the expedition, who may not be particu- 

 larly engaged at the time in other important duties. 



