It should be remembered that nine-tenths, probably, of the dynamite made is used in peaceful pursuits; in mining, and similar works. Indeed, since its invention great engineering achievements have been accomplished which would have been entirely impossible without it. I do not see, then, much room for doubt that it has on the whole been a great blessing to humanity. Such certainly its inventor regards it. “If I did not look upon it as such,” I heard him say recently, “I should close up all my manufactories and not make another ounce of the stuff.” He is a strong advocate of peace, and regards with the utmost horror the use of dynamite by assassins and political conspirators. When the news of the Haymarket tragedy in Chicago reached him, M. Nobel was in Paris, and I well remember his expressions of horror and detestation at the cowardly crime. “Look you,” he exclaimed. “I am a man of peace. But when I see these miscreants misusing my invention, do you know how it makes me feel? It makes me feel like gathering the whole crowd of them into a storehouse full of dynamite and blowing them all up together!” Few people know what dynamite is, though it has attracted a good deal of attention of late, and before considering its use as a mode for political murder it may be well here to give an account of its making. Nitro-glycerine, although not the strongest explosive known to science, is the only one of any industrial importance, as the others are too dangerous for manufacture. It was discovered by Salvero, an Italian chemist, in 1845. It is composed of glycerine and nitric acid compounded together in a certain proportion, and at a certain temperature. It is very unsafe to handle, and to this reason is to be ascribed the invention of dynamite, which is, after all, merely a sort of earth and nitro-glycerine, the use of the earth being to hold the explosive safely as a piece of blotting-paper would hold water until it was needed. Nobel first tried kieselguhr, or flint froth, which was ground to a powder, heated thoroughly and dried, and the nitro-glycerine was kneaded into it like so much dough. Of course, many other substances are now used, besides infusorial earth, as vehicles for the explosive—saw-dust, rotten-stone, charcoal, plaster of Paris, black powder, etc., etc. These are all forms of dynamite or giant powder, and mean the same thing. When the substance is thoroughly kneaded, work that must be done with the hands, it is molded into sticks somewhat like big candles, and wrapped in parchment paper. Nitro-glycerine has a sweet, aromatic, pungent taste, and the peculiar property of causing a violent headache when placed on the tongue or the wrist. It freezes at 40° Fahrenheit, and must be melted by the application of water at a temperature of 100°. In dynamite the usual proportions are 25 per cent. of earth and 75 per cent. of nitro-glycerine. The explosive is fired by fulminate of silver or mercury in copper caps.