I call attention to the words which I have italicized. It is well known that the mere principle of revolving barrels in firearms was already old, even when Worcester wrote. I have seen guns of the kind over three hundred years old, and they are not uncommon in foreign museums. But it would appear that the marquis was acquainted with the principle of the self-cocking pistol. How else could he propose to discharge a gun a dozen times, without changing it from one hand to another? And this, I believe, was not known before his day. But how this could have been conveniently carried out, without some application of detonating powders in place of flint, steel, and gunpowder, I do not understand. That he was very probably familiar with the application of such chemical detonating agents has already been suggested. In another number, he suggests the application of this principle to 'carbines.' So in No. LXII, he proposes 'a way for a harquebuss, a crock, or ship musket, six upon a carriage, shooting with such expedition as, without danger, one may charge, level, and discharge them sixty times in a minute of an hour, two or three together.' To which he adds the following: 'No. LXIV.--A seventh, tried and approved before the late king (of ever blessed memory), and an hundred lords and commons, in a cannon of eight inches and half a quarter, to shoot bullets of sixty-four pounds weight, and twenty-four pounds of powder, twenty times in six minutes; so clear from danger, that after all were discharged, a pound of butter did not melt, being laid upon the cannon britch, nor the green oil discoloured that was first anointed and used between the barrel thereof, and the engine having never in it, nor within six foot, but one charge at a time.' Several improvements of this kind are suggested in the 'Century,' which evidently involve different principles from that of the modern revolver, in reference to which difference we are informed in a 'note by the author,' that 'when I first gave my thoughts to make guns shoot often, I thought there had been but one only exquisite way inventible; yet, by several trials, and much charge, I have perfectly tried all of these.'