Thank you @Nablator for the introduction of Guy de Montanor ( Guido di Montanor )
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Scala Philosophorum
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Quote:Guido de Montanor, in his Scala Philosophorum, which is a real stair of transmutations instead of the classic seven operations stairs, uses a more ancient list.
In his Bibliotheca Chemica, Ferguson is a little source of info on this author: “Guido de Montanor, or Montano, or Guido Magnus de Monte, but not Guido de Monte was a Frenchmen quoted by Ripley and quoting in his turn Roger Bacon. Hence he can be attributed to a period between those”.
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Scala Philosophorum
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