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Alchemical letters to Isaac Newton - Paul Ferguson - 09-19-2023
"Henri van Swinden's archive in the Leiden Special Collections contains four draft letters by Swiss mathematician Fatio De Duillier to Isaac Newton from 1693. The previously unpublished letters shed light on Newton’s alchemical practices and his reliance on circulation of knowledge."
https://www.leidenspecialcollectionsblog.nl/articles/fatio-de-duilliers-draft-alchemical-letters-to-isaac-newton