The ancient doctrine of signatures or similitudes.
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D049690:History, Ancient; D049692:History, Early Modern 1451-1600; D049691:History, Medieval; D049711:History, Modern 1601-; D006801:Humans; D019368:Nature; D010686:Philosophy, Medical / Q000266:history*; D008517:Phytotherapy / Q000266:history*; D010946:Plants, Medicinal; D013561:Symbolism; D013812:Therapeutics / Q000266:history*