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One day, Priestley held his burning lens over a calx of mercury (or mercuric oxide).— Citizendium, the Citizens' Compendium - Recent changes [en]
The theory thought of the re-formation of a metal from its calx, that is, the earthy substance which remains after combustion, as the combination of two things to produce one, apparently homogeneous, substance.— The Story of Alchemy and the Beginnings of Chemistry
He proposed to cause a metallic calx (that is, the substance formed by calcining a metal in the air) to give up the "air" which had been absorbed in its formation, and to compare this "air" with atmospheric air About this time Priestley visited Paris, saw Lavoisier, and told him of the new "air" he had obtained by heating calcined mercury.— The Story of Alchemy and the Beginnings of Chemistry

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