Licence: Public Domain Mark
Credit: Sir Robert Stawell Ball. Photograph by W. & D. Downey. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0025990/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Sir Robert Stawell Ball. Photograph by W. & D. Downey. Wellcome Collection. Source: Wellcome Collection.