Cobb loaded the gun with one of the ordinary cartridges, and then placed a bundle of common wrapping-paper on end at the other side of the room. Taking a position in the further corner, he discharged the piece at this improvised target. The bullet entered the paper and penetrated through about forty sheets. Then, loading with one of his own cartridges, he again took the same position, and again discharged the piece. Upon examination, it was found that over ninety-seven sheets of paper had been perforated. Cobb laid the gun on the table and said: "You see the effect of the two cartridges! Which is the superior of the two? Of course, mine; and in effect as forty is to ninety-seven, or even more, perhaps. This is the power that will grant me my leave! This explosive is my own invention. You have seen its power. If we put gunpowder at one and that of gun-cotton at four, then that of meteorite, my new compound, would be nearly forty-six. "Like gun-cotton, there is little or no smoke upon discharge, as you have witnessed; but, unlike gun-cotton or nitro-glycerine, the explosion is not instantaneous, but similar to that of gunpowder. Now, the amount of gas evolved upon the explosion of one grain of gunpowder is, in volume, about three hundred of carbonic acid and nitrogen, but the true volume, considering the heat, is about fifteen hundred times that of the original charge. Meteorite has a rate of combustion three times slower than gunpowder, while the volume of gas liberated is more than sixty-six times that of the latter, or about one hundred thousand times its original bulk. This is the power, as I have said, that gives me my leave of absence. On the 22d of last month I sent an application to the War Department for a leave for the purpose of perfecting a gun in which to use these cartridges. With the application I sent some of the cartridges. I also sent a sealed packet containing the formula for making the explosive, but with the positive directions that the formula should not be made known until I had perfected my experiments. I asked for leave until I had completed my work. Through the little influence I possessed, I pressed this application to be granted in the manner I asked. Yesterday I received my leave, and here it is;" and he handed Craft the following paper: "WAR DEPARTMENT, A.-G. O., } WASHINGTON, November 9, 1887.} "Special Orders, No. 156. [Extract.] "5. Leave of absence is hereby granted First Lieutenant Junius Cobb, Second Cavalry, from December 1, 1887, until surrendered by him in writing, or upon his return to duty, for purposes which he has communicated to this department. "By command of Lieut.-Gen. Sheridan. "R. C. DRUM, "_Adjutant-General_."