With the Republic of Mexico it is our true policy to cultivate the most friendly relations. Since the ratification of the treaty of Guadalupe Hidalgo nothing has occurred of a serious character to disturb them. A faithful observance of the treaty and a sincere respect for her rights can not fail to secure the lasting confidence and friendship of that Republic. The message of my predecessor to the House of Representatives of the 8th of February last, communicating, in compliance with a resolution of that body, a copy of a paper called a protocol, signed at Queretaro on the 30th of May, 1848, by the commissioners of the United States and the minister of foreign affairs of the Mexican Government, having been a subject of correspondence between the Department of State and the envoy extraordinary and minister plenipotentiary of that Republic accredited to this Government, a transcript of that correspondence is herewith submitted. The commissioner on the part of the United States for marking the boundary between the two Republics, though delayed in reaching San Diego by unforeseen obstacles, arrived at that place within a short period after the time required by the treaty, and was there joined by the commissioner on the part of Mexico. They entered upon their duties, and at the date of the latest intelligence from that quarter some progress had been made in the survey. The expenses incident to the organization of the commission and to its conveyance to the point where its operations were to begin have so much reduced the fund appropriated by Congress that a further sum, to cover the charges which must be incurred during the present fiscal year, will be necessary. The great length of frontier along which the boundary extends, the nature of the adjacent territory, and the difficulty of obtaining supplies except at or near the extremes of the line render it also indispensable that a liberal provision should be made to meet the necessary charges during the fiscal year ending on the 30th of June, 1851. I accordingly recommend this subject to your attention. In the adjustment of the claims of American citizens on Mexico, provided for by the late treaty, the employment of counsel on the part of the Government may become important for the purpose of assisting the commissioners in protecting the interests of the United States. I recommend this subject to the early and favorable consideration of Congress. Complaints have been made in regard to the inefficiency of the means provided by the Government of New Granada for transporting the United States mail across the Isthmus of Panama, pursuant to our postal convention with that Republic of the 6th of March, 1844. Our charge d'affaires at Bogota has been directed to make such representations to the Government of New Granada as will, it is hoped, lead to a prompt removal of this cause of complaint.