Portret van Pieter Stortenbeker (1828-1898), kunstschilder (c. 1884) by Pieter de Josselin de Jong https://www.rawpixel.com/image/13743678/image-face-frame-personFree Image from public domain licenseNicholas Hart, a hypersomnic man. Line engraving by R. Graves. https://www.rawpixel.com/image/13960098/nicholas-hart-hypersomnic-man-line-engraving-gravesFree Image from public domain licenseHoofd van een zwarte jongeman met tulband met veren (1747) by Cornelis Troost https://www.rawpixel.com/image/13793255/hoofd-van-een-zwarte-jongeman-met-tulband-met-veren-1747-cornelis-troostFree Image from public domain licenseFriedrich Heinrich Alexander von Humboldt. Stipple engraving by C. Cook after Emma Gaggiotti-Richards, 1854. https://www.rawpixel.com/image/14003388/image-face-person-artFree Image from public domain licenseMarcellin Pierre Eugène Berthelot. Process print by H. Manuel. https://www.rawpixel.com/image/14002789/marcellin-pierre-eugene-berthelot-process-print-manuelFree Image from public domain licenseSir William George Armstrong. Process print after Lock & Whitfield. https://www.rawpixel.com/image/13991424/sir-william-george-armstrong-process-print-after-lock-whitfieldFree Image from public domain licenseThomas Graham Balfour. Etching by W. Strang after himself. https://www.rawpixel.com/image/14006987/thomas-graham-balfour-etching-strang-after-himselfFree Image from public domain licenseThe physiognomy of mental diseases / [Sir Alexander Morison]. https://www.rawpixel.com/image/13996466/the-physiognomy-mental-diseases-sir-alexander-morisonFree Image from public domain licenseAlfred Armand Louis Marie Velpeau. Lithograph by J.B.A. Lafosse, 1865, after P. Petit. https://www.rawpixel.com/image/14021883/image-face-person-clothingFree Image from public domain licenseSir Thomas Longmore. Mixed method print by C.J. Tomkins after Sir G. Reid. https://www.rawpixel.com/image/14020784/sir-thomas-longmore-mixed-method-print-cj-tomkins-after-sir-reidFree Image from public domain licenseRobert Brown. Line engraving by C. Fox, 1837, after H. W. Pickersgill. https://www.rawpixel.com/image/13996775/robert-brown-line-engraving-fox-1837-after-pickersgillFree Image from public domain license