The act "to raise for a limited time an additional military force, and for other purposes," and which authorizes the raising of ten additional regiments to the Regular Army, to serve during the war and to be disbanded at its termination, which was presented to me on the 11th instant and approved on that day, will constitute an important part of our military force. These regiments will be raised and moved to the seat of war with the least practicable delay. It will be perceived that this act makes no provision for the organization into brigades and divisions of the increased force which it authorizes, nor for the appointment of general officers to command it. It will be proper that authority be given by law to make such organization, and to appoint, by and with the advice and consent of the Senate, such number of major-generals and brigadier-generals as the efficiency of the service may demand. The number of officers of these grades now in service are not more than are required for their respective commands; but further legislative action during your present session will, in my judgment, be required, and to which it is my duty respectfully to invite your attention. Should the war, contrary to my earnest desire, be protracted to the close of the term of service of the volunteers now in Mexico, who engaged for twelve months, an additional volunteer force will probably become necessary to supply their place. Many of the volunteers now serving in Mexico, it is not doubted, will cheerfully engage at the conclusion of their present term to serve during the war. They would constitute a more efficient force than could be speedily obtained by accepting the services of any new corps who might offer their services. They would have the advantage of the experience and discipline of a year's service, and will have become accustomed to the climate and be in less danger than new levies of suffering from the diseases of the country. I recommend, therefore, that authority be given to accept the services of such of the volunteers now in Mexico as the state of the public service may require, and who may at the termination of their present term voluntarily engage to serve during the war with Mexico, and that provision be made for commissioning the officers. Should this measure receive the favorable consideration of Congress, it is recommended that a bounty be granted to them upon their voluntarily extending their term of service. This would not only be due to these gallant men, but it would be economy to the Government, because if discharged at the end of the twelve months the Government would be bound to incur a heavy expense in bringing them back to their homes and in sending to the seat of war new corps of fresh troops to supply their place.