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Medical advertising postcard featuring an X-ray image of aerophagia with a hypotonic stomach, taken by Dr. Lacaille at the Hôtel-Dieu in Paris. The reverse details the therapeutic indications of 'Tablette Perroud' for hyperchlorhydria, ulcers, colitis, and oxyuriasis, highlighting its pleasant taste and tolerance. The publisher is the Perroud Laboratory, 7, rue des Archers, Lyon.