The President having thought proper to appoint you joint commissioners plenipotentiary, on the part of the United States, to treat with the court of Madrid on the subjects of the navigation of the Mississippi, arrangements on our limits, and commerce, you will herewith receive your commission; as also observations on these several subjects, reported to the President and approved by him, which will therefore serve as instructions for you. These expressing minutely the sense of our government and what they wish to have done, it is unnecessary for me to do more here than desire you to pursue these objects unremittingly, and endeavor to bring them to an issue, in the course of the ensuing summer. It is desirable that you should keep an exact journal of what shall pass between yourselves and the court or their negotiator, and communicate it from time to time to me, that your progress and prospects may be known. You will be the best judges whether to send your letters by Lisbon, Cadiz, or what other route; but we shall be anxious to hear from you as often as possible. If no safe conveyance occurs from Madrid to Lisbon, and your matter should be of importance sufficient to justify the expense, a courier must be sent; but do not incur the expense, unless it be to answer some good end. I have the honor to be, with great and sincere esteem, Gentlemen, your most obedient and most humble servant, Th: Jefferson. LETTER C.--TO COLONEL PICKERING, March 28, 1792 TO COLONEL PICKERING. Philadelphia, March 28, 1792. Sir, The President has desired me to confer with you on the proposition I made the other day, of endeavoring to move the posts at the rate of one hundred miles a day. It is believed to be practicable here, because it is practised in every other country. The difference of expense alone appeared to produce doubts with you on the subject. If you have no engagement for dinner to-day, and will do me the favor to come and dine with me, we will be entirely alone, and it will give us time to go over the matter and weigh it thoroughly. I will, in that case, ask the favor of you to furnish yourself with such notes as may ascertain the present expense of the posts, for one day in the week, to Boston and Richmond, and enable us to calculate the savings which may be made by availing ourselves of the stages. Be pleased to observe that the stages travel all the day. There seems nothing necessary for us then, but to hand the mail along through the night till it may fall in with another stage the next day, if motives, of economy should oblige us to be thus attentive to small savings. If a little latitude of expense can be allowed, I should be for only using the stages the first day, and then have our riders. I am anxious that the thing should be begun by way of experiment, for a short distance, because I believe it will so increase the income of the post-office as to show we may go through with it. I shall hope to see you at three o’clock.