Attribution 4.0 International (CC BY 4.0)
You can use this work for any purpose, including commercial uses, without restriction under copyright law. You should also provide attribution to the original work, source and licence. Read more about this licence.
Credit
M0007789: Observations made by Joseph Lister on the effects of irritants upon pigments and vessels of a frog's foot. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.