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Above, portrait of Daniel Sennert in a roundel; centre, a man representing Experience holds the staff of Aesculapius and a lily, while a woman representing Reason holds a balance and a torch; below, Hippocrates and Hermes shake hands, representing the union of herbal and chemical medicine. Engraving by M. Merian, ca. 1631. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.