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Wednesday 11 November 1663

Up and to my office all the morning, and at noon to the Coffee- house, where with Dr. Allen some good discourse about physique and chymistry. And among other things, I telling him what Dribble the German Doctor do offer of an instrument to sink ships; he tells me that which is more strange, that something made of gold, which they call in chymistry Aurum fulminans, a grain, I think he said, of it put into a silver spoon and fired, will give a blow like a musquett, and strike a hole through the spoon downward, without the least force upward; and this he can make a cheaper experiment of, he says, with iron prepared. Thence to the 'Change, and being put off a meeting with T. Trice, he not coming, I home to dinner, and after dinner by coach with my wife to my periwigg maker's for my second periwigg, but it is not done, and so, calling at a place or two, home, and there to my office, and there taught my wife a new lesson in arithmetique and so sent her home, and I to several businesses; and so home to supper and to bed, being mightily troubled with a cold in my stomach and head, with a great pain by coughing.