Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Achromatic microscope by Powell and Lealand, 1869. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/M0017163/full/800%2C/0/default.jpg)
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Achromatic microscope by Powell and Lealand, 1869. Wellcome Collection. Source: Wellcome Collection.