"The commerce which may be carried on with the people inhabiting the line you will pursue, renders a knowledge of those people important. You will therefore endeavour to make yourself acquainted, as far as a diligent pursuit of your journey shall admit, with the names of the nations and their numbers;
"The extent and limits of their possessions;
"Their relations with other tribes or nations;
"Their language, traditions, monuments;
"Their ordinary occupations in agriculture, fishing, hunting, war, arts, and the implements for these;
"Their food, clothing, and domestic accommodations;
"The diseases prevalent among them, and the remedies they use;
"Moral and physical circumstances which distinguish them from the tribes we know;
"Peculiarities in their laws, customs, and dispositions;
"And articles of commerce they may need or furnish, and to what extent.