Licence: Public Domain Mark
Credit: Leonardo da Vinci. Stipple engraving by J. Posselwhite. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0006062EL/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Leonardo da Vinci. Stipple engraving by J. Posselwhite. Wellcome Collection. Source: Wellcome Collection.