filled with crushed ore , and over the ore is put sand or ashes to a thickness of two digits , and tamped ; then in the mouth of this pot is inserted the mouth of another smaller pot and cemented with lute , lest the vapours are emitted . The ore heated by the fire exhales the quicksilver , which ,… … The fifth method is not very unlike the fourth . In the place of these pots are set other pots , likewise of earthenware , having a narrow bottom and a wide mouth . These are nearly filled with crushed ore , which is likewise covered with ashes to a depth of two digits and tamped in . The pots are
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