"Stahl, in operating upon [Glauber's salt], thought he had discovered the proof, that the inflammability not only of metals, but likewise of all other substances, was owing to the same principle phlogiston]. is entirely dissipated or consumed in combustion, therefore, says this philosopher, it must be phlogiston nearly pure; by heating charcoal with metallic earths, they become metals; therefore they are compounds of metallic earths and phlogiston: by heating Glauber's salt, which consists of sulphuric acid and fossil alkali, with charcoal, a compound of sulphur and is obtained; therefore sulphur is an acid combined with phlogiston."
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Note "fossil alkali" definition from William Campbell Ottley, A Dictionary of Chemistry and of Mineralogy (1826) follows: "Alkali, Fossil. Alkali, Marine. Alkali, Mineral. (See Soda) Soda obtained the names of mineral, fossil, or marine alkali, from its forming a component part of rock salt and sea salt."
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