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[We took eight Ounces (Troy weight) of Block-Tin, which being cut into bits was put into a good round Vial with a long neck, and then warily held over quick Coals without touching them till it was melted; after which it was kept al∣most continually shaken, to promote the Calcination, near an hour, the
Metal being all the while in fusion, and the Glass kept at some di∣stance from the throughly kindled Coals. The most part of this time the orifice of the Vial was cover'd with a Cap of Paper (which some∣times fell off by moving the Glass) to keep the Air and Steams of the Coals from getting into the neck. And at the end of this time, he that held the Glass being tir'd, and having his Hand almost scorch'd, the Vial being remov'd from the fire was bro∣ken, that we might take out the Metalline Lump, which had a little darkish Calx here and there upon the upper surface, but much more be∣neath, where it had been contiguous to the bottom of the Glass; then put∣ting all this carefully freed from little fragments of broken Glass into the same Ballance with the self-same counterpoise I had us'd before, I found, according to my Expectation, an in∣crease of weight, which amounted to eighteen Grains, that the Tin had acquir'd by this Operation.]