Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Achromatic microscope by Powell and Lealand, 1869. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Achromatic microscope by Powell and Lealand, 1869. Wellcome Collection. Source: Wellcome Collection.