Dr Cornelis Hendrik à Roy (1751-1833), Physician and Biographer (1833) by Jan Adam Kruseman https://www.rawpixel.com/image/13744706/image-face-person-artFree Image from public domain licenseWilliam Hyde Wollaston. Line engraving by W. Skelton, 1830, after J. Jackson. https://www.rawpixel.com/image/13992517/william-hyde-wollaston-line-engraving-skelton-1830-after-jacksonFree Image from public domain license