WASHINGTON, October 18, 1807. SIR,--I have duly received your favor of the 8th inst., covering, at the request of the general court of Massachusetts, a memorial to the Senate and House of Representatives of the United States, on behalf of Benjamin Hichborn and others, with a desire that I would communicate and recommend the same to both Houses of Congress. I should avail myself with particular pleasure of every occasion of doing what would be acceptable to the legislative and executive authorities of Massachusetts, and which should be within the limits of my functions. The Executive of the Union is, indeed, by the Constitution, made the channel of communication between _foreign_ powers and the United States. But citizens, whether individually, or in bodies corporate, or associated, have a right to apply directly to any department of their government, whether legislative, executive, or judiciary, the exercise of whose powers they have a right to claim; and neither of these can regularly offer its intervention in a case belonging to the other. The communication and recommendation by me to Congress of the memorial you have been pleased to enclose me, would be an innovation, not authorized by the practice of our government, and therefore the less likely to add to its weight or effect. Thus restrained from serving you in the exact way desired, I have thought I could not better do it than by a prompt return of the papers, that no time might be lost in transmitting them through the accustomary channels of your Senators and Representatives in Congress; and I avail myself of the occasion of assuring you of my very high respect and consideration. TO DOCTOR BARTON. WASHINGTON, October 18, 1807. DEAR SIR,--I received last night a diploma from the Linnæan Society of Philadelphia, doing me the honor of associating me to their body. I pray you to do me the favor of assuring the society of my sensibility for this mark of their notice, and of my thanks. Sincerely associated with the friends of science, in spirit and inclination, I regret the constant occupations of a different kind, which put out of my power the proper co-operations with them, had I otherwise the talents for them. I shall gladly embrace any occasion which can be offered of being useful to the society, as a mark of my acknowledgments for their favors, with my thanks for the copy of your discourse, enclosed at the same time. I pray you to receive my friendly salutations, and assurances of great respect and esteem. TO JAMES GAMBLE, ESQ. WASHINGTON, October 21, 1807.