The Anti-Slavery Society Convention, 1840, by Benjamin Robert Haydon (died 1846), given to the National Portrait Gallery… https://www.rawpixel.com/image/7666291/image-art-vintage-public-domainFree Image from public domain licenseGeorge Combe lecturing on phrenology, portrayed with protuberances on his head. Coloured lithograph 1826. https://www.rawpixel.com/image/13968305/image-cartoon-person-bookFree Image from public domain licenseGeorge Combe lecturing on phrenology, portrayed with protuberances on his head. Coloured lithograph 1826. https://www.rawpixel.com/image/14015868/image-cartoon-person-bookFree Image from public domain license