The steamer Virginius was on the 26th day of September, 1870, duly registered at the port of New York as a part of the commercial marine of the United States. On the 4th of October, 1870, having received the certificate of her register in the usual legal form, she sailed from the port of New York and has not since been within the territorial jurisdiction of the United States. On the 31st day of October last, while sailing under the flag of the United States on the high seas, she was forcibly seized by the Spanish gunboat Tornado, and was carried into the port of Santiago de Cuba, where fifty-three of her passengers and crew were inhumanly, and, so far at least as relates to those who were citizens of the United States, without due process of law, put to death.

It is a well-established principle, asserted by the United States from the beginning of their national independence, recognized by Great Britain and other maritime powers, and stated by the Senate in a resolution passed unanimously on the 16th of June, 1858, that--American vessels on the high seas in time of peace, bearing the American flag, remain under the jurisdiction of the country to which they belong, and therefore any visitation, molestation, or detention of such vessel by force, or by the exhibition of force, on the part of a foreign power is in derogation of the sovereignty of the United States. In accordance with this principle, the restoration of the Virginius and the surrender of the survivors of her passengers and crew, and a due reparation to the flag, and the punishment of the authorities who had been guilty of the illegal acts of violence, were demanded. The Spanish Government has recognized the justice of the demand, and has arranged for the immediate delivery of the vessel, and for the surrender of the survivors of the passengers and crew, and for a salute to the flag, and for proceedings looking to the punishment of those who may be proved to have been guilty of illegal acts of violence toward citizens of the United States, and also toward indemnifying those who may be shown to be entitled to indemnity. A copy of a protocol of a conference between the Secretary of State and the Spanish minister, in which the terms of this arrangement were agreed to, is transmitted herewith.

The correspondence on this subject with the legation of the United States in Madrid was conducted in cipher and by cable, and needs the verification of the actual text of the correspondence. It has seemed to me to be due to the importance of the case not to submit this correspondence until the accurate text can be received by mail. It is expected shortly, and will be submitted when received.

In taking leave of this subject for the present I wish to renew the expression of my conviction that the existence of African slavery in Cuba is a principal cause of the lamentable condition of the island. I do not doubt that Congress shares with me the hope that it will soon be made to disappear, and that peace and prosperity may follow its abolition.

The embargoing of American estates in Cuba, cruelty to American citizens detected in no act of hostility to the Spanish Government, the murdering of prisoners taken with arms in their hands, and, finally, the capture upon the high seas of a vessel sailing under the United States flag and bearing a United States registry have culminated in an outburst of indignation that has seemed for a time to threaten war. Pending negotiations between the United States and the Government of Spain on the subject of this capture, I have authorized the Secretary of the Navy to put our Navy on a war footing, to the extent, at least, of the entire annual appropriation for that branch of the service, trusting to Congress and the public opinion of the American people to justify my action.

Assuming from the action of the last Congress in appointing a Committee on Privileges and Elections to prepare and report to this Congress a constitutional amendment to provide a better method of electing the President and Vice-President of the United States, and also from the necessity of such an amendment, that there will be submitted to the State legislatures for ratification such an improvement in our Constitution, I suggest two others for your consideration:

First. To authorize the Executive to approve of so much of any measure passing the two Houses of Congress as his judgment may dictate, without approving the whole, the disapproved portion or portions to be subjected to the same rules as now, to wit, to be referred back to the House in which the measure or measures originated, and, if passed by a two-thirds vote of the two Houses, then to become a law without the approval of the President. I would add to this a provision that there should be no legislation by Congress during the last twenty-four hours of its sitting, except upon vetoes, in order to give the Executive an opportunity to examine and approve or disapprove bills understandingly.

Second. To provide by amendment that when an extra session of Congress is convened by Executive proclamation legislation during the continuance of such extra session shall be confined to such subjects as the Executive may bring before it from time to time in writing.

The advantages to be gained by these two amendments are too obvious for me to comment upon them. One session in each year is provided for by the Constitution, in which there are no restrictions as to the subjects of legislation by Congress. If more are required, it is always in the power of Congress, during their term of office, to provide for sessions at any time. The first of these amendments would protect the public against the many abuses and waste of public moneys which creep into appropriation bills and other important measures passing during the expiring hours of Congress, to which otherwise due consideration can not be given.

TREASURY DEPARTMENT.