had that right ascension, which will give the distance of the two meridians. This last process will be simplified by taking, for the moment of observation, that of an appulse of the moon and a known star, or when the moon and a known star are in the same vertical. I suggested this to Mr. Briggs, who considered it as correct and practicable, and proposed communicating it to the Philosophical Society; but I observed that it was too obvious not to have been thought of before, and supposed it had not been adopted in practice, because of no use at sea, where a meridian cannot be had, and where alone the nations of Europe had occasion for it. Before his confirmation of the idea, however, Capt. Lewis was gone. In conversation afterwards with Baron Humboldt, he observed that the idea was correct, but not new; that I would find it in the third volume of Delalande. I received two days ago the third and fourth volumes of Montucla's History of Mathematics, finished and edited by Delalande; and find, in fact, that Morin and Vanlangren, in the seventeenth century, proposed observations of the moon on the meridian, but it does not appear whether they meant to dispense with the time-keeper. But a meridian at sea being too impracticable, their idea was not pursued. The purpose of troubling you with these details, is to submit to your consideration and decision whether any use can be made of them advantageously in our future expeditions, and particularly that up the Red river.

Your letter on the current of the Mississippi, and paper on the same subject, corrected at once my doubts on your theory of the currents of that river. Constant employment in a very different line permits me to turn to philosophical subjects only when some circumstance forces them on my attention. No occurrence had called my mind to this subject, particularly since I had first been initiated into the original Torricellian doctrine of the velocities at different depths, being in the sub-duplicate ratio of the depths. And though Buat had given me his book while at Paris, your letter was the first occasion of my turning to it, and getting my mind set to rights to a certain degree. There is a

subsequent work by Bernard, which is said to have furnished corrections and additions to Buat ; but I have never seen it.

The work we are now doing is, I trust, done for posterity, in such a way that they need not repeat it. For this we are much indebted to you, not only for the labor and time you have devoted to it, but for the excellent method of which you have set the example, and which I hope will be the model to be followed by others. We shall delineate with correctness the great arteries of this great country. Those who come after us will extend the ramifications as they become acquainted with them, and fill up the canvas we begin. With my acknowledgments for your zealous aid in this business, accept my friendly salutations, and assurances of great esteem and respect.

TO DOCTOR SIBLEY.

WASHINGTON, May 27, 1805. DEAR SIR,-I have been some time a debtor for your letters of March 20th and September 2d, of the last year. A constant pressure of things which will not admit delay, prevents my acknowledging with punctuality the letters I receive, although I am not insensible to the value of the communications, and the favor done me in making them. To these acknowledgments I propose to add a solicitation of a literary kind, to which I am led by your position, favorable to this object, and by a persuasion that you are disposed to make to science those contributions which are within your convenience. The question whether the Indians of America have emigrated from another continent, is still undecided. Their vague and imperfect traditions can satisfy no mind on that subject. I have long considered their languages as the only remaining monument of connection with other nations, or the want of it, to which we can now have access. They will likewise show their connections with one another. Very early in life, therefore, I formed a vocabulary of such objects as, being present everywhere, would probably have a name

in every language; and my course of life having given me opportunities of obtaining vocabularies of many Indian tribes, I have done so on my original plan, which though far from being perfect, has the valuable advantage of identity, of thus bringing the languages to the same points of comparison. A letter from you to General Dearborne, giving valuable information respecting the Indians west of the Mississippi and south of the Arkansas, presents a much longer list of tribes than I had expected; and the relations in which you stand with them, and the means of intercourse these will furnish, induce me to hope you will avail us of your means of collecting their languages for this purpose. I enclose you a number of my blank vocabularies, to lessen your trouble as much as I can. I observe you mention several tribes which, having an original language of their own, nevertheless have adopted some other, common to other tribes. But it is their original languages I wish to obtain. I am in hopes you will find persons situated among or near most of the tribes, who will take the trouble of filling up a vocabulary. No matter whether the orthography used be English, Spanish, French, or any other, provided it is stated what the orthography is. To save unnecessary trouble, I should observe that I already possess the vocabularies of the Attacapas and Chetimachas, and no others within the limits before mentioned. I have taken measures for obtain

ing those north of the Arcansa, and already possess most of the languages on this side the Mississippi. A similar work, but on a much greater scale, has been executed under the auspices of the late empress of Russia, as to the red nations of Asia, which, however, I have never seen. A comparison of our collection with that will probably decide the question of the sameness or difference of origin, although it will not decide which is the mother country, and which the colony. You will receive from Gen. Dearborne some important instructions with respect to the Indians. Nothing must be spared to convince them of the justice and liberality we are determined to use towards them, and to attach them to us indissolubly. Accept my apologies for the trouble I am giving you, with my salutations and assurances of respect.

TO THOMAS PAINE.

WASHINGTON, June 5, 1805. DEAR SIR,-Your letters, Nos. 1, 2, 3, the last of them dated April the 20th, were received April the 26th. I congratulate you on your retirement to your farm, and still more that it is of a character so worthy of your attention. I much doubt whether the open room on your second story will answer your expectations. There will be a few days in the year in which it will be delightful, but not many. Nothing but trees, or Venetian blinds, can protect it from the sun. The semi-cylindrical roof you propose will have advantages. You know it has been practised on the cloth market at Paris. De Lorme, the inventor, shows many forms of roofs in his book to which it is applicable. I have used it at home for a dome, being one hundred and twenty degrees of an oblong octagon, and in the capitol we unite two quadrants of a sphere by a semi-cylinder; all framed in De Lorme's manHow has your planing machine answered? Has it been tried and persevered in by any workmen ?

ner.

France has become so jealous of our conduct as to St. Domingo (which in truth is only the conduct of our merchants), that the offer to become a mediator would only confirm her suspicions. Bonaparte, however, expressed satisfaction at the paragraph in my message to Congress on the subject of that commerce. With respect to the German redemptioners, you know I can do nothing unless authorized by law. It would be made a question in Congress, whether any of the enumerated objects to which the Constitution authorizes the money of the Union to be applied, would cover an expenditure for importing settlers to Orleans. The letter of the revolutionary sergeant was attended to by General Dearborne, who wrote to him informing him how to proceed to obtain his land.

Doctor Eustis' observation to you, that "certain paragraphs in the National Intelligencer" respecting my letter to you, "supposed to be under Mr. Jefferson's direction, had embarrassed Mr. Jefferson's friends in Massachusetts; that they appeared like a

half denial of the letter, or as if there was something in it not proper to be owned, or that needed an apology," is one of those mysterious half confidences difficult to be understood. 'That tory printers should think it advantageous to identify me with that paper, the Aurora, &c., in order to obtain ground for abusing me, is perhaps fair warfare. But that any one who knows me personally should listen one moment to such an insinuation, is what I did not expect. I neither have, nor ever had, any more connection with those papers than our antipodes have; nor know what is to be in them until I see it in them, except proclamations and other documents sent for publication. The friends in Massachusetts who could be embarrassed by so weak a weapon as this, must be feeble friends indeed. With respect to the letter, I never hesitated to avow and to justify it in conversation. In no other way do I trouble myself to contradict anything which is said. At that time, however, there were certain anomalies in the motions of some of our friends, which events have at length reduced to regularity.

It seems very difficult to find out what turns things are to take in Europe. I suppose it depends on Austria, which, knowing it is to stand in the way of receiving the first hard blows, is cautious of entering into a coalition. As to France and England we can have but one wish, that they may disable one another from injuring others.

Accept my friendly salutations, and assurances of esteem and respect.

TO MR. MADISON.

MONTICELLO, August 7, 1805.

DEAR SIR,-On a view of our affairs with Spain, presented me in a letter from C. Pinckney, I wrote you on the 23d of July, that I thought we should offer them the status quo, but immediately proposed provincial alliance with England. I have not yet received the whole correspondence. But the portion of the pa