Licence: Public Domain Mark
Credit: Humphry Sandwith. Stipple engraving by D. J. Pound after Watkins. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/L0019856/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Humphry Sandwith. Stipple engraving by D. J. Pound after Watkins. Wellcome Collection. Source: Wellcome Collection.