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John Snow was already a famous anaesthetist and had been one of the first to use chloroform. He had even administered it to Queen Victoria. He carried out his work in London during the third large epidemic of cholera in England. Prior to his work there was complete confusion about the cause of cholera as illustrated in the previous slides. His work on cholera has led him to be called “The father of epidemiology”. The link shows a photograph of John Snow.