Some Fellows of the Royal Society: a key to the identities of the sitters. Wood engraving, 1885. https://www.rawpixel.com/image/13985855/image-face-flower-personFree Image from public domain licenseFellows of the Royal Society: Sir John Evans, bust of Sir Isaac Newton, Lord Kelvin, R.B. Clifton, G.G. Stokes, Sir Michael… https://www.rawpixel.com/image/13989095/photo-image-people-clothing-manFree Image from public domain licenseWilliam Worrell Mayo. Photogravure with line engraving. https://www.rawpixel.com/image/13997024/william-worrell-mayo-photogravure-with-line-engravingFree Image from public domain licenseWilliam Worrall Mayo with his sons Charles Horace Mayo (left) and William James Mayo (right). Copy photograph after the ca.… https://www.rawpixel.com/image/13982648/photo-image-face-people-shirtFree Image from public domain licenseFellows of the Royal Society: Sir John Evans, bust of Sir Isaac Newton, Lord Kelvin, R.B. Clifton, G.G. Stokes, Sir Michael… https://www.rawpixel.com/image/13976693/photo-image-people-clothing-manFree Image from public domain licenseWilliam Worrall Mayo with his sons William James Mayo (left) and Charles Horace Mayo (right) Photograph, 1909. https://www.rawpixel.com/image/13982059/photo-image-face-plant-personFree Image from public domain license