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Chymia, or Alchemy and Spagyrism, is the art of resolving compound bodies into their principles and of combining these again.
Georg Ernst Stahl -
Briefly, in the act of composition, as an instrument there intervenes and is most potent, fire, flaming, fervid, hot; but in the very substance of the compound there intervenes, as an ingredient, as it is commonly called, as a material principle and as a constituent of the whole compound the material and principle of fire, not fire itself. This I was the first to call phlogiston.
Georg Ernst Stahl