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.
Creative Commons Attribution (CC BY 4.0) terms and conditions https://creativecommons.org/licenses/by/4.0
'Two men with a physician, discussing the chamaeleon on the table before them. Coloured lithograph after HH.' by Henry Heath. Credit: Wellcome Collection. CC BY