Geber's Best Writings on Alchemy

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LEt the Calcinatory Furnace be made square, in length four foot, and three foot in breadth, and let the thickness of the Walls be half a foot; after this manner: Luna, Venus, Mars, or other Things to be calcined, must be put into Dishes or Pans of most strong Clay, such as of which Crucibles are made, that they may persist in the Asperity of Fire, even to the total Combustion of the Thing to be calcined.