EXPERIMENT I and II.
EIGHT ounces of Block-Tin being cut in pieces and put into a good round Vial, with a long neck, and being cautiously melted over Quick-Coals, the Glass being frequently shaken, to promote Calcination, near an hour, the neck of the Vial being most of the time preserved from the steams of the Coals with a cover of Paper; the Tin which was partly calcined, increased eighteen grains in weight. This being done we melted the remaining me∣tal into thin Plates, by which Operation, it lost three grains of the eighteen it had got; but being a second time exposed to Calcination in another Vial, it afforded a much greater Quantity of it than before, and increased in weight to eight ounces and twenty four grains. In which Tryals it is observable, that agitation much contributes to the Calcination of Metals.