I must here observe, that although, in all cases, I lay the greatest stress upon the use of this arm _in great quantities_, it is not therefore to be presumed, that the effect of an individual Rocket carcass, the smallest of which contains as much combustible matter as the 10-inch spherical carcass, is not at least equal to that of the 10-inch spherical carcass: or that the explosion of a shell thrown by a Rocket, is not in its effects equal to the explosion of that same shell thrown by any other means: but that, as the power of _instantaneously_ throwing the _most unlimited_ quantities of carcasses or shells is the _exclusive property_ of this weapon, and as there can be no question that an infinitely greater effect, both physical[A] as well as moral, is produced by the instantaneous application of any quantity of ammunition, with innumerable other advantages, than by a fire in slow succession of that same quantity: so it would be an absolute absurdity, and a downright waste of power, not to make this exclusive property the general basis of every application of the weapon, limited only by a due proportion between the expenditure and the value of the object to be attained--a limit which I should always conceive it more advisable to exceed than to fall short of. [A] For a hundred fires breaking out at once, must necessarily produce more destruction than when they happen in succession, and may therefore be extinguished as fast as they occur. There is another most important use in this weapon, in the storming of fortified places, which should here be mentioned, viz. that as it is the only description of artillery ammunition that can ever be carried into a place by a storming party, and as, in fact, the heaviest Rockets may accompany an escalade, so the value of it in these operations is infinite, and no escalade should ever be attempted without. It would enable the attackers, the moment they have got into the place, not only to scour the parapet most effectually, and to enfilade any street or passage where they may be opposed, and which they may wish to force; but even if thrown at random into the town, must distract the garrison, while it serves as a certain index to the different storming parties as to the situation and progress of each party. [Illustration: _Plate 10_  Fig. 1  Fig. 2] THE USE OF ROCKETS FROM BOATS. Plate 11 represents two men of war’s launches throwing Rockets. The frame is the same as that used for bombardment on shore, divested of the legs or prypoles, on which it is supported in land service; for which, afloat, the foremast of the boat is substituted. To render, therefore, the application of the common bombarding frame universal, each of them is constructed with a loop or traveller, to connect it with the mast, and guide it in lowering and raising, which is done by the haulyards.