"'I do not believe that there are men who possess such powers,' I said. 'There are knaves who may pretend to have such powers, but it is only to gain money from the credulous. In all my reading I have never come upon a single instance of any man who has really exercised such powers, nor do I believe that such powers exist. Men have at all times believed in portents, and even a Roman army would turn back were it on the march against an enemy, if a hare ran across the road they were following; I say not that there may not be something in such portents, though even of this I have doubts. Still, like dreams, they may be sent to warn us, but assuredly man has naught to do with their occurrence, and I would, were I not a peaceful man, draw my sword as readily against the most famous enchanter as against any other man of the same strength and skill, with his weapon.' "I could see that the good knight was shocked at the light way in which I spoke of magicians; and, indeed, the power of superstition over men, otherwise sensible, is wonderful. However, he took his leave without saying more than that he and the men-at-arms would be ready if I sent for them." CHAPTER III WAT TYLER That evening Mr. Ormskirk continued the subject of his talk of the afternoon. "You looked surprised, Edgar, when I said that I told Sir Ralph I had made some preparations for defence, and that some of the compounds in my laboratory are as dangerous as the common people regard them, although that danger has naught to do with any magical property. You must know that many substances, while wholly innocent in themselves, are capable of dealing wide destruction when they are mixed together; for example, saltpetre, charcoal, and sulphur, which, as Friar Bacon discovered, make, when mixed together, a powder whose explosive power is well-nigh beyond belief, and which is now coming into use as a destructive agent in war. Many other compounds can be produced of explosive nature, some indeed of such powerful and sudden action that we dare not even make experiments with them. "Many other strange things have been discovered, some of which may seem useless at present, but may, upon further experiments on their properties, turn out of value to man. Such a substance I discovered two years ago. I was experimenting upon bones, and endeavouring to ascertain whether a powder might not be procured which, when mixed with other substances, would produce unexpected results. After calcining the bones, I treated the white ash with various acids and alkaloids, and with fire and water, returning again and again to the trials when I had time. While conducting these experiments, I found that there was certainly some substance present with whose nature I was altogether unacquainted.