Sir John Burdon Sanderson, 1870.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Sir John Burdon Sanderson, 1870. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Sir John Burdon Sanderson, 1870. Wellcome Collection. Source: Wellcome Collection.