The Second Key of Basil Valentine from the "Twelve Keys of Basil Valentine," an influential alchemical work first published in 1599 by Johann Thölde. It discusses general alchemical principles. Each chapter, or "key," is an allegorical description of one step in the process of creating the philosopher's stone, a legendary alchemical substance capable of turning base metals into gold.

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Second Key of Basil Valentine, 1599

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