Licence: Public Domain Mark
Credit: William Davis. Stipple engraving by J.S. Dickson after W. Allen. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0001489/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: William Davis. Stipple engraving by J.S. Dickson after W. Allen. Wellcome Collection. Source: Wellcome Collection.