Licence: Public Domain Mark
Credit: Leaves of birch (Betula species). Pen drawing with pencil. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0043563/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: Leaves of birch (Betula species). Pen drawing with pencil. Wellcome Collection. Source: Wellcome Collection.