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After his time at
Utrecht, he returned to Leiden and served as Professor of medicine at Leiden University, where he remained for the rest of his life. Hahn wrote prolifically on chemistry and toxicology and held public experiments and lectures on experimental physics and astronomy. He corresponded
53:, working as Professor of philosophy, astronomy, and experimental physics (1753-1775), and then Professor of botany of chemistry (1759-1775). He was elected as a member of the American Philosophical Society in 1770.
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The Life of
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Emigrants from the Holy Roman Empire to the Dutch
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