I duly received your favor of the 1st. of Nov. accompanied with some copies of the Prospectus, and a few days since your letter of the 5th. March reached me. I owe you an apology for being so tardy in my reply to the former letter. It reached me at Washington, while I was confined with a severe illness, with which, since Oct. last, I have till lately been much afflicted. I was, most of the session, in such a state of health, as to be kept at my lodgings, and when in my place, in the House of Representatives, little able to attend to business. As soon as I went abroad, after the receipt of your letter, I consulted some of the most influential members of Congress, as to the probability of being able to pass a bill for the free introduction of your work. Last winters session was the short session, terminating by the Constitution on the 3d. of March. At this session, it is always very difficult to pass any bills, originating during the session. The time is regularly taken up by bills, prepared the previous winter. In addition to this circumstance, more than half of the last session was taken up, by an impeachment before the Senate. A procedure, which suspended during its continuance, the legislative business of the two Houses, and left no time for scarce anything, beyond the annual appropriation bills for the support of the government. Under these circumstances, the gentlemen, whom I consulted, were of opinion with me that it was impossible, for want of time, to pass a bill in your favor, and that it was therefor better not to attempt it, at the late session, but to reserve it for next winter, when it can be brought up seasonably, and with good hope of success. I shall take great pleasure to seize the first moment, at the opening of the next session, to bring the subject before Congress. The portions of your work, which arrived at Washington before I left it, were publicly exhibited in the library, and attracted great attention and unqualified admiration. The same is true of the copy received by the Boston Athenaeum. The plates were specially exhibited in the great hall of the Athenaeum, to the entire satisfaction and delight of those who saw them. The copy-right law authorizes any citizen of the U. States to take out a copy-right of his work, on depositing a _printed copy_ of the _title page_ in the office of the District Court. I infer from your letter of the 5th. of March, that you had sent copies of the printed sheets of your work to Drs. Harlan and M. Mertrie [McMurtie] of Philadelphia with a view of having the copy-right.