Paul Ehrlich "Beitrage zur Kenntniss....", first page
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Paul Ehrlich "Beitrage zur Kenntniss....", first page. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Paul Ehrlich "Beitrage zur Kenntniss....", first page. Wellcome Collection. Source: Wellcome Collection.