The Artillery Museum contains specimens of every kind of cannon used, from the original breech-loader to the breech-loader of the present day. No. 1 of the catalogue is a small cannon of the earliest period, made of forged iron and furnished with a breech-loading apparatus; 14 and the numbers following are siege-pieces of various kinds abandoned by the English at Meaux, after the bombardment of 1422. The projectiles for these pieces were of stone. No. 7 comes from the ancient residence, near Verdun, of the Knights of Malta; and next to it is a fine cannon in bronze given to the Knights of Rhodes by the Emperor Sigismund in 1434. No. 19, also in bronze, belongs to the reign of Louis XI.; and, like No. 18, comes from Rhodes. It bears this inscription:--“At the command of Loys [Louis], by the grace of God King of France, eleventh of this name, I was cast at Chartres by Jean Chollet, knight, artillery master to this sovereign.” Next but one in the series is a large mortar of bronze, cast at the command of the Grand Master of the Order of the Hospitallers of Jerusalem, Pierre d’Aubusson, 1480. The construction of the various pieces, as we follow them in chronological order, becomes simplified, then complicated, then simplified again. Gun-carriages and ammunition-chests vary in form, until we find at last the field artillery, under Napoleon III., of one pattern; though two kinds of guns, light and heavy, are still used in the reserve artillery. The rifled cannon introduced by the Emperor Napoleon, which did such effective service during the Italian war of 1859, was looked upon by the French as the best possible field-gun; and, possibly from exaggerated loyalty taking the form of servility, the commission of officers to whom the breech loading rifled guns of Krupp were submitted a few years before the war of 1870 rejected them as in no way superior to the gun of Napoleonic invention actually in use. Since the last war the French have adopted breech-loading rifled pieces more or less on the model of the Krupp guns, treated with such disdain by the military advisers of Napoleon III. Next to the pieces arranged in chronological order have been placed a number of foreign guns taken at various epochs from the enemy, including, among the latest acquisitions of this kind, a number of curious highly ornamented Chinese guns. Apart from the interesting exhibition of musketry and artillery in the military museum, a few words may here be said on the history of fire-arms generally. The use of fire-arms preceded by some centuries the famous invention of the German monk, Berthold Schwartz; which, in Europe, is known to have been anticipated a century earlier by the English monk, Roger Bacon. The art of making gunpowder was known in the second half of the thirteenth century to the Arabs of the north of Africa and the Moors of Spain.