DEAR SIR,--Your favor of the 18th is duly received. Be assured that I value no act of friendship so highly as the communicating facts to me, which I am not in the way of knowing otherwise, and could not therefore otherwise guard against. I have had too many proofs of your friendship not to be sensible of the kindness of these communications, and to receive them with peculiar obligation. The receipt of Mr. Rose's answer has furnished the happiest occasion for me to present to Congress a complete view of the ground on which we stand with the two principal belligerents, and, with respect to France, to lay before them, _for the public_, every communication received from that government since the last session, including those heretofore sent, in order that they also may be published, and let our constituents see whether these papers gave just ground for the falsehoods which have been so impudently advanced. We shall hope to see you to-day. Affectionate salutations. TO DOCTOR WISTAR. WASHINGTON, March 20, 1808. DEAR SIR,--Yours of the 12th is received. Congress, I think, will rise in about three weeks,--say about the 11th of April, and I shall leave this five or six days after, on a visit of some length to Monticello. This illy accords with your journey to the westward in May; but can you not separate your excursion to this place from the western journey? Between Philadelphia and this place is but two days, and the roads are already fine. I would propose, therefore, that you should come a few days before Congress rises, so as to satisfy that article of your curiosity. The bones are spread in a large room, where you can work at your leisure, undisturbed by any mortal, from morning till night, taking your breakfast and dinner with us. It is a precious collection, consisting of upwards of three hundred bones, few of them of the large kinds which are already possessed. There are four pieces of the head, one very clear, and distinctly presenting the whole face of the animal. The height of his forehead is most remarkable. In this figure, the indenture at the eye gives a prominence of six inches to the forehead. There are four jaw-bones tolerably entire, with several teeth in them, and some fragments; three tusks like elephants; one ditto totally different, the largest probably ever seen, being now from nine to ten feet long, though broken off at both ends; some ribs; an abundance of teeth studded, and also of those of the striated or ribbed kind; a fore-leg complete; and then about two hundred small bones, chiefly of the foot. This is probably the most valuable part of the collection, for General Clarke, aware that we had specimens of the larger bones, has gathered up everything of the small kind. There is one horn of a colossal animal. The bones which came do not correspond exactly with General Clarke's description; probably there were some omissions of his packers.