In the communication made to the Senate on the 13th of June, in answer to its resolution of the 2d of March last, there appears to have been, among other papers, sundry letters addressed to the Department of State by certain claimants or their agents containing reflections upon the character of the umpire appointed by His Prussian Majesty pursuant to the convention between the United States and the Mexican Republic of the 11th of April, 1839. As the call was for all communications which had been addressed to the Department of State by any of the claimants under that convention relative to the proceedings and progress of the mixed commission, the copies were prepared and submitted without attracting the attention either of the head of the Department or myself. If those letters had been noticed, their transmission to the Senate, if transmitted at all, would have been accompanied by a disclaimer on the part of the Executive of any intention to approve such charges. The Executive has no complaint to make against the conduct or decisions of the highly respectable person appointed by his sovereign umpire between the American and Mexican commissioners. JOHN TYLER. WASHINGTON, _August 10, 1842_. _To the Senate of the United States_: In compliance with your resolution of the 18th July, I herewith transmit a letter from the Acting Secretary of the Treasury and a report from the Commissioner of Public Buildings, together with the accompanying documents.[78] JOHN TYLER. [Footnote 78: Relating to the macadamizing of Pennsylvania Avenue, Washington D.C.] WASHINGTON, _August 11, 1842_. _To the Senate of the United States_: I have the satisfaction to communicate to the Senate the results of the negotiations recently had in this city with the British minister, special and extraordinary. These results comprise-- First. A treaty to settle and define the boundaries between the territories of the United States and the possessions of Her Britannic Majesty in North America, for the suppression of the African slave trade, and the surrender of criminals fugitive from justice in certain cases. Second. A correspondence on the subject of the interference of the colonial authorities of the British West Indies with American merchant vessels driven by stress of weather or carried by violence into the ports of those colonies. Third. A correspondence upon the subject of the attack and destruction of the steamboat _Caroline_. Fourth. A correspondence on the subject of impressment.