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Robert Koch in his laboratory

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This represents work Koch did to understand cholera in South Africa, but it undoubtedly portrays a laboratory very close to what he earlier created for his studies of Bacillus anthracis. Photogravure of gouache painting. (Source: Osler W. The evolution of modern medicine: a series of lectures delivered at Yale University on the Silliman Foundation in April 1913. New Haven, Connecticut: Yale University Press, 1922:210. Courtesy of the Wellcome Collection, London, England. Photo number: M0000732. Note: Image has been flipped horizontally by Dr. Douglas J Lanska to match the original image. The Wellcome Collection image is a mirror image of the original. Creative Commons Attribution 4.0 International License, https://creativecommons.org/licenses/by/4.0/deed.en.)