Again, a ship of 2,500 at 12 miles, running 6,500 miles could not transport cargo at less than $115; one of 5,000 tons would transport it at $52; one of 10,000 tons would transport it at $33 per ton; and one of 20,000 tons burthen, as for instance the "Leviathan," would transport it at $24 per ton. And while none of the three first named sizes of vessels would transport it 12,500 miles, the one of 20,000 tons, running 12 miles per hour, would transport it at $80 per ton; and running 14 miles per hours, at $430 per ton. Two things must, however, not be forgotten in this; that the ship to do this must always run entirely full and have no waste room; and that these prices are comparisons between different steamers, and not with sailing vessels, which, running much more slowly and with but little expense, transport the freight far more cheaply. The following table will set forth very clearly in a summary view, the Time, Horse-power, Coal, and Cargo for a steamer of good average quality running on passages of 1,000 miles, 2,000 miles, and 3,000 miles, and at a speed varying from 6 to 18 miles per hour. It will be observed that a steamer of 3,000 tons can not take power and coal enough to run on a 2,000 miles passage above 17 knots per hour, and that one of 3,000 tons also can not run on a 3,000 miles passage at a speed above 16 knots per hour. Observe the small quantity of cargo and the large quantity of coal for a steamer of 3,000 tons on a 3,000 miles passage at 16 miles per hour. COAL AND CARGO TABLE: No. IV. _Calculated for the mean Displacement of 3,000 Tons._ KEY: A: SPEED--PER HOUR. B: HORSE-POWER. C: WEIGHT OF HULL AND ENGINES. D: PASSAGE 1,000 NAUTICAL MILES. Time. E: PASSAGE 1,000 NAUTICAL MILES. Coal. F: PASSAGE 1,000 NAUTICAL MILES. Cargo. G: PASSAGE 2,000 NAUTICAL MILES. Time. H: PASSAGE 2,000 NAUTICAL MILES. Coal. I: PASSAGE 2,000 NAUTICAL MILES. Cargo. J: PASSAGE 3,000 NAUTICAL MILES. Time. K: PASSAGE 3,000 NAUTICAL MILES. Coal. L: PASSAGE 3,000 NAUTICAL MILES. Cargo.