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the first Experiment we observed, that upon the pouring of water upon Sal Armoniac there ensued an intense degree of Cold, and we have elsewhere recited, that the like effect was produc'd by putting, instead of common water, Oyl of Vitriol to Sal Armoniac; but now, to shew further, what influence Motion and Texture may have upon such Trials, it may not be amiss to adde the following Experiment: To twelve ounces of Sal Armoniac we put by degrees an equal weight of water, and whilst the Liquor was dissolving the Salt, and by that action producing a great Coldness, we warily pour'd in twelve ounces also of good Oyl of Vitriol; of which new mixture the event was, that a notable degree of Heat was quickly produced in the Glass wherein the Ingredients were confounded, as unlikely as it seemed, that, whereas