Claude Bernard performing an experiment; from a photogravure of the picture of 1889 by Leon L'Hermite in the Sorbonne.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Claude Bernard performing an experiment; from a photogravure of the picture of 1889 by Leon L'Hermite in the Sorbonne. Wellcome Collection. Source: Wellcome Collection.