On these two principles M. Paixhans reared and elaborated in minutest detail the revolutionary system with which his name is associated. No new element or discovery was necessary for giving effect to his designs. Indeed he expressly disclaimed having introduced any novelty: “Nous n’avons donc rien inventé, rien innové, et presque rien changé; nous avons seulement réuni des élémens épars, auxquels il suffisait de donner, avec un peu d’attention, la grandeur et les proportions convenables, pour atteindre le but important que nous étions proposé.” It may be said, in fact, that unity of calibre had been an ideal sought for years before M. Paixhans’ time; while shell fire, the New Arm of 1822, was almost the logical consequence of Robins’ discoveries in the principles of gunnery, extended as they were by the researches of Doctors Hutton and Gregory. In particular, mention is made by M. Paixhans himself of two of the results brought out by Dr. Hutton’s experiments: one, that the length of the bore of a gun has but a small effect upon the range of its projectile, the range varying as the fifth root of the length; two, that the muzzle velocity may be considered to be independent of the weight of the gun. As to the lack of novelty of shell fire on ship-board, M. Paixhans gives a significant extract from French naval annals. In 1690, it appears, a M. Deschiens had invented a means of firing bombs from long guns horizontally, instead of parabolically as from mortars. This secret was of great use to him; for, falling in with four English ships at sea, he so surprised them by this new invention that, fearful of being set on fire, they drew off and did not attempt to renew battle. This same French captain at a later date attacked two Dutch ships more than a match for him, and, by means of these horizontally fired bombs, sank one and disabled the other. But M. Deschiens died and his secret with him; though, as M. Paixhans remarks, this “secret” would have been easy to find if anyone had looked for it. A whole chapter of _The Genuine Use and Effects of the Gunne_, written by Robert Anderson and published at London in 1674, concerns “the shooting of Granados out of Long Gunnes.”