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.

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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. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.