Alchemical Symbolism in the VMS

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Many alchemist designate mercury and sulfur as primary (materia prima).

Exactly, see page 108:



Non-literal translation:

On these mountains there is an everlasting fire that sublimes the stone and raise it [ him ] to the highest dignity. In this mountains it [ he ] grows quite raw from Sulfur and living Mercurio.
 
Note: "Stone" is masculine in German