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Othmer Collection: Liber de secretis naturae - Paul Ferguson - 09-29-2026
Liber de secretis naturae seu de quinta essentia
The Book of the Secrets of Nature or of the Quintessence
"The Liber de secretis naturae seu de quinta essentia is the central work in the Pseudo-Lullian Alchemical corpus, a large collection of as many as 143 different texts that circulated as the work of Raymond Lull (Ramon Llull or Raimundus Lullus; 1232-1316), the famous Catalan philosopher, theologian, and mystic. "
https://digital.sciencehistory.org/works/82ul4ik