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A physician examines a patient's tongue. Lithograph by Charles Vernier, 1853

"Le docteur. _ Ah! ... si vous avez mangé du raisin tout s'explique: vous avez alors la maladie des pommes de terre dont le remède est encore inconnu ... tranquillisez-vous!" [“The doctor. _ Ah! ... if you have eaten grapes, everything is explained: you then have potato disease for which the cure is still unknown... don't worry!”]. (Courtesy of the Wellcome Library, London, UK. Creative Commons Attribution 4.0 International [CC BY 4.0] license, creativecommons.org/licenses/by/4.0. Edited by Dr. Douglas J Lanska.)

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