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 potent Menstruum than common Spirit of Vinegar, would not constantly produce near such a heat at the beginning of its operation, as the greatness of the seeming Effervescence, then excited, would make one expect, as may appear by the following Observation transcrib'd verbatim out of one of my Adversaria.

[Into eight ounces of Spirit of Verdigrease (into which we had put a while before a standard-Thermoscope to acquire the like temper with the Liquor) we put in a wide-mouthed Glass two ounces of Salt of Tartar, as fast as we durst for fear of making the matter boil over; and though there were a great commotion excited by the action and reaction of the Ingredients, which was attended with a copious froth and a hissing noise; yet 'twas a pretty while e're the Glass was sensibly warm on the outside; but by that time the salt was all dissolv'd, the Liquor in the Thermoscope appear'd to be im-