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took one part of Oyl of Vitriol, and shaking it into twelve parts of water we made a mixture, that at first was sensibly warm; then suffering this to cool, we put a sufficient quantity of it into a wide mouth'd glass, and then we put a good Thermoscope Hermetically seal'd, above whose Ball the compounded liquor reached a pretty way. After some time had been allowed that the liquor in the Thermometer might acquire the temper of the ambient; we put in by degrees as much volatile Salt of Sal Armoniac as would serve to satiate the acid spirits of the mixture: for, though these two made a notable conflict with tumult, noise, and froth, yet 'twas but a cold ebullition (if I may so stile it,) for the spirit in the Thermoscope descended about an inch beneath the mark it rested at, when the seeming effervescence began.