SIR,--I have duly received your letter of December 24th, conveying a tender, by the officers, non-commissioned officers, and privates of the Saratoga Rangers, of their voluntary services to support the Constitution, laws, and integrity of our country, when the constitutional authorities shall declare it necessary, and I now, on the public behalf, return them thanks for this example of patriotic spirit. Always a friend to peace, and believing it to promote eminently the happiness and prosperity of mankind, I am ever unwilling that it should be disturbed until greater and more imperious interests call for an appeal to force. Whenever that shall take place, I feel a perfect confidence that the energy and enterprise displayed by my fellow citizens in the pursuits of peace, will be equally eminent in those of war. The Legislature have now under consideration, in what manner, and to what extent, the executive may be permitted to accept the service of volunteers, should the public peace be disturbed either from without or within. In whatever way they shall give that authority, the Saratoga Rangers may be assured that no unreasonable use shall be made of the proffer which their laudable zeal has prompted them to make. With my acknowledgments to them, I pray you to accept personally the assurance of my high consideration and respect. TO GOVERNOR PINCKNEY. WASHINGTON, January 20, 1807. DEAR SIR,--I received two days ago a letter from General Wilkinson, dated at New Orleans, December 14th, in which he enclosed me an affidavit, of which I now transmit you a copy. You will perceive that it authenticates the copy of a letter from Colonel Burr to the General, affirming that Mr. Alston, his son-in-law, is engaged in the unlawful enterprises he is carrying on, and is to be an actor in them. I am to add, also, that I have received information from another source, that Mr. Alston, while returning from Kentucky last autumn through the upper part of your State, proposed to a Mr. Butler of that part of the country, to join in Colonel Burr's enterprise, which he represented as of a nature to make his fortune, and is understood to have been explained as against Mexico, as well as for separating the Union of these States. That Butler communicated this to a person, of the same part of the country, called Span, who communicated it to a Mr. Horan, the clerk of a court in that quarter; that Butler and Span agreed to join in the enterprise, but Horan refused.