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To Obtain Magnesia

Expose carbonate of magnesia in a crucible to a full red heat for 2 hours, or till the powder suspended in water does not effervesce on the addition of muriatic acid. On the large scale, covered crucibles, made of porous earthen. ware, are employed as the containing vessels, and the heat is applied by placing them in a sort of furnace or oven heated with coke.