An itinerant surgeon extracting stones from a man's head; symbolising the expulsion of 'folly' (insanity), in the background is a manic woman who is waiting for the operation. Photogravure, 1926, after T. de Brij after M. de Vos.

Licence: Public Domain Mark

Credit: An itinerant surgeon extracting stones from a man's head; symbolising the expulsion of 'folly' (insanity), in the background is a manic woman who is waiting for the operation. Photogravure, 1926, after T. de Brij after M. de Vos. Wellcome Collection. Source: Wellcome Collection.