But such reasoners also calculate upon what would happen in an engagement between two fleets, in which steam-ships of a large class would be more numerous on one side than the other; for they could at once act together, regardless of wind or weather, and thus concentrating their force, they could cut off or destroy a certain part of their opponent's fleet, before sailing vessels could possibly come to their assistance. They also calculate upon this manœuvre being repeated upon the remainder of the enemy's ships, which cannot escape from these powerful steamers. These are points, however, for seamen to decide; yet suppose a steamer, calculated to carry only a few traversing guns of the longest range for shot or shells, with what are usually termed percussion locks, to insure good practice even when the vessel is in motion, to be well managed or manœuvred by a skilful naval officer; and should he occasionally use shot heated in the furnaces for the boilers, what a formidable opponent she must prove, especially in a calm, or even in a storm, to any sailing vessel. Many officers may remember what treatment our ships of war frequently met with in parts of the Mediterranean, from even a single Spanish gun-boat, carrying perhaps but one long gun; and when the facility and rapidity of movement of a steamer are considered, there can be no comparison whatever drawn between her and a common gun-boat, even when propelled by sweeps or oars, but which become useless in a rough sea. Such matters as these can, however, be brought by calculation to something very near to certainty as to results. I am aware that the great difficulty which presents itself at present is how to protect from shot the chimneys, paddles, and machinery of war-steamers; but if, in these times, when science is daily performing such wonders amongst us, sufficient rewards were offered for the best plans for this purpose, I have no doubt but we should soon see much accomplished; but even until this may be effected, the position which can be taken up by the steamer will, it is thought, insure her being no great sufferer from the shot fired from a sailing vessel. But these, and many other points connected with steam, will be fully elucidated the very first war in which we may be seriously engaged; but in the mean time much can be immediately done, by merely making some useful experiments, whereby we may, to a considerable extent, be taught whether it be advisable or not for us to continue, at a great expense, building and equipping, at all events for what may be termed home service, the present description of sailing vessels, or whether it would not be prudent to direct more attention to war steamers, or to those ships which are propelled by both sails and steam; though I should fear that this combination of the two propelling powers must be found objectionable, as both would most likely be imperfect.