I.P. Pavlov showing an experiment on a dog in the
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: I.P. Pavlov showing an experiment on a dog in the. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: I.P. Pavlov showing an experiment on a dog in the. Wellcome Collection. Source: Wellcome Collection.