Sir Alexander Fleming. https://wellcomeimages.org/indexplus/obf_images/9a/ca/6ea643833df623213d7dda48033a.jpgGallery: https://wellcomeimages.org/indexplus/image/L0000655.htmlWellcome Collection gallery (2018-04-03): https://wellcomecollection.org/works/k4ezny6h CC-BY-4.0, CC