Hermann Ludwig Ferdinand von Helmholtz. Photograph by W.J. Stacey (?).
- Reference:
- 12890i
Licence: Public Domain Mark
Credit: Hermann Ludwig Ferdinand von Helmholtz. Photograph by W.J. Stacey (?). Wellcome Collection. Source: Wellcome Collection.
Licence: Public Domain Mark
Credit: Hermann Ludwig Ferdinand von Helmholtz. Photograph by W.J. Stacey (?). Wellcome Collection. Source: Wellcome Collection.