As a physician, Sauvages de Lacroix is credited with establishing a methodical nosology for diseases, a classification system that was in the spirit of Thomas Sydenham's earlier work, and was in accordance with methods used by botanists.
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He studied medical textbooks by Thomas Willis, Thomas Sydenham and Nicholas Culpeper, as well as learning the Dutch language with the implication that he probably intended going to Leiden University for a medical degree.