A medical practitioner examining a urine flask and referring to a book, while the patient waits for the diagnosis;, two assistants are preparing ingredients in the background. Mezzotint by R. Purcell, 1766, after D. Teniers, the younger.

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A medical practitioner examining a urine flask and referring to a book, while the patient waits for the diagnosis;, two assistants are preparing ingredients in the background. Mezzotint by R. Purcell, 1766, after D. Teniers, the younger. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.