History of the Expedition under the Command of Captains Lewis and Clark, Vol. I. | Page 6

of the last, and such circumstances as may indicate their character;
"Volcanic appearances;
"Climate, as characterized by the thermometer, by the proportion of rainy, cloudy, and clear days; by lightning, hail, snow, ice; by the access and recess of frost; by the winds prevailing at different seasons; the dates at which particular plants put forth, or lose their flower or leaf; times of appearance of particular birds, reptiles or insects.
"Although your route will be along the channel of the Missouri, yet you will endeavour to inform yourself, by inquiry, of the character and extent of the country watered by its branches, and especially on its southern side. The North river, or Rio Bravo, which runs into the gulf of Mexico, and the North river, or Rio Colorado, which runs into the gulf of California, are understood to be the principal streams heading opposite to the waters of the Missouri, and running southwardly. Whether the dividing grounds between the Missouri and them are mountains or flat lands, what are their distance from the Missouri, the character of the intermediate country, and the people inhabiting it, are worthy of particular inquiry. The northern waters of the Missouri are less to be inquired after, because they have been ascertained to a considerable degree, and are still in a course of ascertainment by English traders and travellers; but if you can learn any thing certain of the most northern source of the Missisipi, and of its position relatively to the Lake of the Woods, it will be interesting to us. Some account too of the path of the Canadian traders from the Missisipi, at the mouth of the Onisconsing to where it strikes the Missouri, and of the soil and rivers in its course, is desirable.
"In all your intercourse with the natives, treat them in the most friendly and conciliatory manner which their own conduct will admit; allay all jealousies as to the object of your journey; satisfy them of its innocence; make them acquainted with the position, extent, character, peaceable and commercial dispositions of the United States; of our wish to be neighbourly, friendly, and useful to them, and of our dispositions to a commercial intercourse with them; confer with them on the points most convenient as mutual emporiums, and the articles of most desirable interchange for them and us. If a few of their influential chiefs, within practicable distance, wish to visit us, arrange such a visit with them, and furnish them with authority to call on our officers on their entering the United States, to have them conveyed to this place at the public expense. If any of them should wish to have some of their young people brought up with us, and taught such arts as may be useful to them, we will receive, instruct, and take care of them. Such a mission, whether of influential chiefs, or of young people, would give some security to your own party. Carry with you some matter of the kine-pox; inform those of them with whom you may be of its efficacy as a preservative from the small-pox, and instruct and encourage them in the use of it. This may be especially done wherever you winter.
"As it is impossible for us to foresee in what manner you will be received by those people, whether with hospitality or hostility, so is it impossible to prescribe the exact degree of perseverance with which you are to pursue your journey. We value too much the lives of citizens to offer them to probable destruction. Your numbers will be sufficient to secure you against the unauthorized opposition of individuals, or of small parties; but if a superior force, authorized, or not authorized, by a nation, should be arrayed against your further passage, and inflexibly determined to arrest it, you must decline its further pursuit and return. In the loss of yourselves we should lose also the information you will have acquired. By returning safely with that, you may enable us to renew the essay with better calculated means. To your own discretion, therefore, must be left the degree of danger you may risk, and the point at which you should decline, only saying, we wish you to err on the side of your safety, and to bring back your party safe, even if it be with less information.
"As far up the Missouri as the white settlements extend, an intercourse will probably be found to exist between them and the Spanish posts of St. Louis opposite Cahokia, or St. Genevieve opposite Kaskaskia. From still further up the river the traders may furnish a conveyance for letters. Beyond that you may perhaps be able to engage Indians to bring letters for the government to Cahokia, or Kaskaskia, on promising that they shall there receive such special compensation as you shall have