While other maritime powers are adding to their navies large numbers of war steamers, it was a wise policy on our part to make similar additions to our Navy.  The four war steamers authorized by the act of the 3d of March, 1847, are in course of construction.

In addition to the four war steamers authorized by this act, the Secretary of the Navy has, in pursuance of its provisions, entered into contracts for the construction of five steamers to be employed in the transportation of the United States mail “from New York to New Orleans, touching at Charleston, Savannah, and Havana, and from Havana to Chagres;” for three steamers to be employed in like manner from Panama to Oregon, “so as to connect with the mail from Havana to Chagres across the Isthmus;” and for five steamers to be employed in like manner from New York to Liverpool.  These steamers will be the property of the contractors, but are to be built “under the superintendence and direction of a naval constructor in the employ of the Navy Department, and to be so constructed as to render them convertible at the least possible expense into war steamers of the first class.”  A prescribed number of naval officers, as well as a post-office agent, are to be on board of them, and authority is reserved to the Navy Department at all times to “exercise control over said steamships” and “to have the right to take them for the exclusive use and service of the United States upon making proper compensation to the contractors therefor.”

Whilst these steamships will be employed in transporting the mails of the United States coastwise and to foreign countries upon an annual compensation to be paid to the owners, they will be always ready, upon an emergency requiring it, to be converted into war steamers; and the right reserved to take them for public use will add greatly to the efficiency and strength of this description of our naval force.  To the steamers authorized under contracts made by the Secretary of the Navy should be added five other steamers authorized under contracts made in pursuance of laws by the Postmaster-General, making an addition, in the whole, of eighteen war steamers subject to be taken for public use.  As further contracts for the transportation of the mail to foreign countries may be authorized by Congress, this number may be enlarged indefinitely.

The enlightened policy by which a rapid communication with the various distant parts of the globe is established, by means of American-built sea steamers, would find an ample reward in the increase of our commerce and in making our country and its resources more favorably known abroad; but the national advantage is still greater—­of having our naval officers made familiar with steam navigation and of having the privilege of taking the ships already equipped for immediate service at a moment’s notice, and will be cheaply purchased by the compensation to be paid for the transportation of the mail in them over and above the postages received.