Licence: Public Domain Mark
Credit: George Alfred Walker ("Graveyard" Walker). Oil painting. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/M0007628/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: George Alfred Walker ("Graveyard" Walker). Oil painting. Wellcome Collection. Source: Wellcome Collection.