"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 stipulated with them. Avail yourself of these means to communicate to us, at seasonable intervals, a copy of your journal, notes and observations of every kind, putting into cypher whatever might do injury if betrayed.
"Should you reach the Pacific ocean, inform yourself of the circumstances which may decide whether the furs of those parts may not be collected as advantageously at the head of the Missouri (convenient as is supposed to the waters of the Colorado and Oregan or Columbia) as at Nootka Sound, or any other point of that coast; and that trade be consequently conducted through the Missouri and United States more beneficially than by the circumnavigation now practised.
"On your arrival on that coast, endeavour to learn if there be any port within your reach frequented by the sea vessels of any nation, and to send two of your trusty people back by sea, in such way as shall appear practicable, with a copy of your notes; and should you be of opinion that the return of your party by the way they went will be imminently dangerous, then ship the whole, and return by sea, by the way either of Cape Horn, or the Cape of Good Hope, as you shall be able. As you will be without money, clothes, or provisions, you must endeavour to use the credit of the United States to obtain them; for which purpose open letters of credit shall be furnished you, authorizing you to draw on the executive of the United States, or any of its officers, in any part of the world, on which draughts can be disposed of, and to apply with our recommendations to the consuls, agents, merchants, or citizens of any nation with which we have intercourse, assuring them, in our name, that any aids they may furnish you shall be honourably repaid, and on demand. Our consuls, Thomas Hewes, at Batavia, in Java, William Buchanan, in the Isles of France and Bourbon, and John Elmslie, at the Cape of Good Hope, will be able to supply your necessities, by draughts on us.
"Should you find it safe to return by the way you go, after sending two of your party round by sea, or with your whole party, if no conveyance by sea can be found, do so; making such observations on your return as may serve to supply, correct, or confirm those made on your outward journey.
"On reentering the United States and reaching a place of safety, discharge any of your attendants who may desire and deserve it, procuring for them immediate payment of all arrears of pay and clothing which may have incurred since their departure, and assure them that they shall be recommended to the liberality of the legislature for the grant of a soldier's portion of land each, as proposed in my message to congress, and repair yourself, with your papers, to the seat of government.
"To provide, on the accident of your death, against anarchy, dispersion, and the consequent danger to your party, and total failure of the enterprise, you are hereby authorized, by any instrument signed and written in your own hand, to name the person among them who shall succeed to the command on your decease, and by like instruments to change the nomination, from time to time, as further experience of the characters accompanying you shall point out superior fitness; and all the powers and authorities given to yourself are, in the event of your death, transferred to, and vested in the successor so named, with further power to him and his successors, in like manner to name each his successor, who, on the death of his predecessor, shall be invested with all the powers and authorities given to yourself. Given under my hand at the city of Washington, this twentieth day of June, 1803.
"Thomas Jefferson,
"President of the United States of America."
While these things were going on here, the country of Louisiana, lately ceded by Spain to France, had been the subject of negotiation at Paris between us and this last power; and had actually been transferred to us by treaties executed at Paris on the thirtieth of April. This information, received about the first day of July, increased infinitely the interest we felt in the expedition, and lessened the apprehensions of interruption from other powers. Every thing in this quarter being now prepared, captain Lewis left Washington on the fifth of July, 1803, and proceeded to Pittsburg, where other articles had been ordered to be provided for him. The men too were to be selected from the military stations on the Ohio. Delays of preparation, difficulties of navigation down the Ohio, and other untoward obstructions, retarded his arrival at Cahokia until the season was so far advanced as to render it prudent to suspend his entering the Missouri before the ice should break up in the succeeding spring.