C.J. (or C.T.) Symons, Sir Henry Hallett Dale, Walter Dowson, H.J. Südmersen and George Barger. Photograph by Percy K.P. Bolton, 1905/1906.

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: C.J. (or C.T.) Symons, Sir Henry Hallett Dale, Walter Dowson, H.J. Südmersen and George Barger. Photograph by Percy K.P. Bolton, 1905/1906. Source: Wellcome Collection.