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Swiss anatomist and embryologist Wilhelm His Sr (1831–1904)

(Source: Mansch A. Medical world: gallery of contemporaries in the field of medical science. Berlin: Adolf Eckstein's Pub House, 1915[?]. Courtesy of the Wellcome Collection, London, England. Creative Commons Attribution [CC BY 4.0] license, creativecommons.org/licenses/by/4.0.)