Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: The most popular agent / Drs. Starkey & Palen. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/b16554024_l0030712-lh-ls.jp2/full/800%2C/0/default.jpg)
Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: The most popular agent / Drs. Starkey & Palen. Source: Wellcome Collection.