Hydrotheraphy treatments, c1902. Steam pack with hot water bottles shown open and closed (top ). Stimulating the larynx with cold water (middle). Full body douches and knee douche (bottom ). One of the oldest forms of medical treatment, hydrotherapy enjoyed a resurgence in popularity in the late 19th century. From Die Neue Heilmethode Lehrbuch by M Platen. (Berlin, c1902). (Photo by Oxford Science Archive/Print Collector/Getty Images)
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