It is clear that, notwithstanding all of the advantages to be gained from increased size, steamers can not support themselves upon the ocean. Let us examine further the case of such a ship as the "Leviathan." I can not see that there is any normal trade in which she can run successfully. She may transport 6,000 tons of measurement goods to Australia; but it will be at the expense of fourteen to sixteen thousand tons of coals if the passage is made in fair time. If not, sailing vessels will subserve all purposes except travel quite as well. And certainly there is no class of freight for Australia or any other portion of the world, which will pay such an enormous coal-bill, and so many other expenses, and the interest and insurance on three and a half to four millions of dollars, just to save a few days in so long a voyage. And if the steamer is to do a freighting as well as passenger business, then a long voyage is essential to her. Running is the legitimate business of a steamer. Her costly engines are put in her for locomotion. Her large corps of engineers, firemen, and coal-passers, are employed for running her, and are of no use when she is lying still, although necessarily on full pay. Her condition is abnormal and unnatural every day that she is lying at the docks, and taking or discharging freight; and hence, every day that she is thus employed she is not performing her proper functions. A sailing ship can better afford to lie still for weeks and await a freight, or slowly receive or discharge cargo; as she must pay only the interest on her investment, her dockage, the captain, and watchmen, and perhaps her depreciation. The prime investment is much less. She has no costly engines and boilers. So are her current expenses. She has none of the costly _employees_ that I have named, and who can never leave a steamer for a day. But eternal motion, flush freights, flush business, good prices, and constant employment, are everywhere essential to the steamer.