The next morning we went down to the shop. I explained to him all about the nature of the experiment that I was about to try, and told him that, if he had any timidity, the time to abscond was then and there. He told me that he was not afraid of anything, if I was not. "Very well, then," I said, "I do not expect the thing to blow up; otherwise, I would not be here." I got my time-watch ready, and told him to press the electric button to ignite the motorite. Instantly there was a terrific explosion. The windows were blown out into the street, and pieces of the shattered apparatus were driven into the ceiling and into the wall all about us; but fortunately neither of us was hit. John looked calmly about him for a moment, and then at me, and remarked: "God, she busted!" While we were recovering from our amazement, half a dozen policemen rushed into the place, accompanied by a priest. I explained the mishap the best way I could, and, seeing that the priest was a handsome, genial, good-natured fellow, I appealed to him. He had a little chat with the policemen, and they all left. I sent that priest a box of the best cigars that I could buy. Under the counsel and advice of the landlord I then moved away from there. I next bought a house, and in the back yard I built a laboratory with no windows or doors in it, except a skylight at the top and the windows and doors that fronted my house. The walls were of brick, and made thick. The skylight at the top was a large one, and was arranged to open up full size. Special precautions were taken by means of various attachments to cause the roof to stay on in case of emergency. A new apparatus was made and erected and got ready to test. This time my wife was my assistant, and we arranged to touch the thing off by electricity from the house. Again it exploded, and one of the fragments of the apparatus, coming through the open door, struck the wooden wall behind which my wife and I were standing and nearly passed through it. On entering the laboratory, I discovered for the first time what was the actual cause of the trouble, namely, the longitudinal flaw already referred to, evidenced by the fragments of the motorite that remained after the explosion, for motorite, like smokeless gunpowder, when subjected to explosive pressure, is immediately extinguished upon the release of the pressure, so that when the apparatus blew up, all of the unconsumed motorite was extinguished, just as when the projectile leaves the gun any unburned smokeless powder is extinguished and is blown out in front of the gun, where the partially consumed grains may be recovered. The next motorite was made by rolling the material into sheets, cutting into discs, sealing them together under pressure, and in that way building up the bars, which precluded the possibility of there being any flaws. Some motorite was soon made in this manner, and another apparatus constructed, which was tested and which worked very satisfactorily.