But the difficulties in the way of this service are so numerous as to be readily palpable to all who examine it. No vessel that is well fitted for naval service is well adapted to that of the post. The post requires great speed, and hence, full-powered vessels. The navy does not require so great speed, and hence, the steamers are seldom more than auxiliaries. They are built heavier and fuller, and are not so adapted to speed. Filling them with the power necessary to drive them with sufficient rapidity for mail packets would unfit them for the efficient service of war. Naval vessels are, moreover, filled and weighted down with guns, stores, men, and a thousand things which would be in the way if they were employed for the mails. They have no state-rooms, cabins, saloons, etc.; and if they had them so as to accommodate passengers, they would be unfit for the war service. Unless so fitted they could not accommodate passengers, as they will not lash themselves up in hammocks under the deck, as thick as grass, as man-of-war's men will. If they are to be strictly naval vessels while running, they will be filled with their own men, and could not take passengers even if they had state-room accommodations for them. They would thus be deprived entirely of this source of income. Again, they could take no freight; and if a passenger mail steamer has to depend upon both freight and passengers for an income to meet the large expenses, which are generally three, five, and often even ten times the sum of subsidy received from the Government, then the naval vessel running in the postal service will be deprived of both these sources of income, and must fall back on the department for all of its expenses, which would be three, five, and even ten times as much as the sum paid private companies for carrying the mail.