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known that Salt-peter being put into common water produces a sensible Coldness in it, as it also does in many other Liquors: But that the same Salt put into a Liquor of another Constitution may have a quite differing effect, I have convinc'd some inquisitive persons by mingling eight ounces of fine Salt-peter powder'd with six ounces of Oyl of Vitriol: For by that commixture with a Salt that was not only actually, but, as to many other bodies, potentially cold, the Oyl of Vitriol, that was sensibly cold before, quickly conceived a considerable degree of Heat, whose Effects also became visible in the copious Fumes that were emitted by the incalescent Mixture.