RESOLVED, That the Committee on Military Affairs and the Militia be directed to consider the expediency of providing by law for the establishment of a corps composed of men especially enlisted for hospital and ambulance service, with officers commissioned purposely to command them, who shall have the entire charge, under the medical officers, of the hospitals and of the ambulance wagons, so as to enlarge the usefulness of this humane service, and give to it the efficiency derived from organization. CELEBRATION OF EMANCIPATION. LETTER TO A PUBLIC MEETING OF COLORED CITIZENS IN BOSTON, JANUARY 1, 1863. WASHINGTON, January 1, 1863. MY DEAR SIR,--Owing to the wretched condition of the mails between New York and Washington, I did not receive your letter of the 27th in season for an answer to be used at the proposed meeting. I am glad that you celebrated the day. It deserved your celebration, your thanksgiving, and your prayers. On that day an angel appeared upon the earth. Accept my best wishes for your association, and believe me, dear Sir, Faithfully yours, CHARLES SUMNER. PRUDENCE IN OUR FOREIGN RELATIONS. REMARKS IN THE SENATE, ON RESOLUTIONS AGAINST FRENCH INTERFERENCE IN MEXICO, FEBRUARY 3, 1863. In the Senate, January 19th, Mr. McDougall, a Democratic Senator from California, introduced the following resolutions, setting forth the duty of the United States to take steps against French interference in Mexico. “_Resolved by the Senate_ (_the House of Representatives concurring_), That the present attempt by the Government of France to subject the Republic of Mexico to her authority by armed force is a violation of the established and known rules of International Law, and that it is, moreover, a violation of the faith of France, pledged by the treaty made at London on the 31st day of October, 1861, between the allied Governments of Spain, France, and England, communicated to this Government over the signatures of the representatives of the allies, by letter of the 30th day of November, 1861, and particularly and repeatedly assured to this Government through its minister resident at the Court of France. “_Resolved further_, That the attempt to subject the Republic of Mexico to French authority is an act not merely unfriendly to this Republic, but to free institutions everywhere; and that it is regarded by this Republic as not only unfriendly, but as hostile. “_Resolved further_, That it is the duty of this Republic to require of the Government of France that her armed forces be withdrawn from the territories of Mexico.