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original: "SPLENDOR SOLIS"
An "Adept" is a master who has successfully completed the alchemical "Great Work." Paracelsus (1493–1541) was a Swiss physician and alchemist who is considered the father of toxicology and modern medicine.
Allegorical images use symbolic figures to represent chemical and spiritual processes. Vellum is a high-quality writing surface made from specially prepared animal skin.
"Occult" here refers to "hidden" knowledge or secrets of nature. The "Philosopher's Stone" was the legendary goal of alchemy, believed to transform lead into gold and grant longevity. "The Red Lion" is a symbolic term often used for a specific chemical catalyst or a stage of the alchemical process.
J.K. refers to Julius Kohn, who edited and provided the commentary for this English edition.