This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Donnan FG. Scan of picture of British scientist Donnan who died in Article in Journal of Chemical Education volume page Donnan small grainy lowresolution scan by me would seem to qualify as fair use Subject died over years ago and photo was published years ago No alternative image seems to be available Please advise DEFAULTSORT