Lyon Playfair, 1st Baron Playfair. Photograph by Barraud. https://www.rawpixel.com/image/14020701/lyon-playfair-1st-baron-playfair-photograph-barraudFree Image from public domain licenseGeneral Lying In Hospital, York Road, Lambeth: labour ward staff and students. Photograph, 1908. https://www.rawpixel.com/image/13986073/photo-image-face-people-hospitalFree Image from public domain licenseGerard Mercator [Cremer]. Line engraving by H. Goltzius, 1574. https://www.rawpixel.com/image/13999275/gerard-mercator-cremer-line-engraving-goltzius-1574Free Image from public domain licenseUnidentified bearded man and a woman, seated by Bradley and Rulofson https://www.rawpixel.com/image/14306460/unidentified-bearded-man-and-woman-seated-bradley-and-rulofsonFree Image from public domain licenseJames Prescott Joule. Photogravure, ca. 1913, after G. Patten, 1863. https://www.rawpixel.com/image/13982957/james-prescott-joule-photogravure-ca-1913-after-patten-1863Free Image from public domain licenseHugh Downman. Stipple engraving by R. Woodman, 1809, after J. Downman, 1796. https://www.rawpixel.com/image/13987025/hugh-downman-stipple-engraving-woodman-1809-after-downman-1796Free Image from public domain licenseJoseph Dawson seated in a chair: portrait in a studio in San Salvador, the Bahamas. Photograph, 1855/1865. https://www.rawpixel.com/image/13977669/photo-image-face-person-artFree Image from public domain licenseWilliam Thomson, Baron Kelvin. Photograph by T. & R. Annan & Sons. https://www.rawpixel.com/image/14005623/william-thomson-baron-kelvin-photograph-annan-sonsFree Image from public domain licenseThomas Denman. Line engraving by W. Skelton, 1792, after L. F. Abbott. https://www.rawpixel.com/image/14005248/thomas-denman-line-engraving-skelton-1792-after-abbottFree Image from public domain licenseSir Kenelm Digby. Line engraving by B. Reading after A. van Dyck. https://www.rawpixel.com/image/13973587/sir-kenelm-digby-line-engraving-reading-after-van-dyckFree Image from public domain licenseJohann Heinrich Jung-Stilling. Line engraving by J. H. Lips after himself. https://www.rawpixel.com/image/14008989/johann-heinrich-jung-stilling-line-engraving-lips-after-himselfFree Image from public domain licenseLorenzo Colorigia. Drawing in black chalk with white heightening. https://www.rawpixel.com/image/13980900/lorenzo-colorigia-drawing-black-chalk-with-white-heighteningFree Image from public domain licenseSaint Mary (the Blessed Virgin) and Saint Joseph with the Christ Child and an angel. Process print by G. Petit after L.… https://www.rawpixel.com/image/13971868/image-angel-cartoon-faceFree Image from public domain licenseJellyfish in dark blue ocean. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3304397/free-photo-image-jellyfish-animal-animals-images-picturesFree Image from public domain licenseChina. Photograph, 1981, from a negative by John Thomson, 1869. https://www.rawpixel.com/image/14013827/china-photograph-1981-from-negative-john-thomson-1869Free Image from public domain licenseSir Joseph Banks. Mezzotint by S. W. Reynolds, 1834, after Sir J. Reynolds. https://www.rawpixel.com/image/13986012/sir-joseph-banks-mezzotint-reynolds-1834-after-sir-reynoldsFree Image from public domain licenseA pug wrapped in a plaid blanket sitting on the forest floor. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3304941/free-photo-image-animal-pug-bagFree Image from public domain licenseOutlines of lectures on mental diseases / By Alexander Morison. https://www.rawpixel.com/image/14016698/outlines-lectures-mental-diseases-alexander-morisonFree Image from public domain licenseJean-Baptiste Bouillaud. Lithograph by C. Bornemann after P.L. Pierson. https://www.rawpixel.com/image/13993785/jean-baptiste-bouillaud-lithograph-bornemann-after-pl-piersonFree Image from public domain license"Professor de Aroca" []. Oil painting by an Italian painter, 18th century. https://www.rawpixel.com/image/13974048/professor-aroca-oil-painting-italian-painter-18th-centuryFree Image from public domain licenseAdam Austin. Photograph after a painting by Allan Ramsay, 1762. https://www.rawpixel.com/image/14016347/adam-austin-photograph-after-painting-allan-ramsay-1762Free Image from public domain licenseA money lender sits at her kitchen table studying her money. Line engraving by D. Sornique after F.A. Kraus. https://www.rawpixel.com/image/13981280/image-cartoon-face-personFree Image from public domain licenseJames Ferguson. Stipple engraving by T. Wright after J. Northcote. https://www.rawpixel.com/image/14017520/james-ferguson-stipple-engraving-wright-after-northcoteFree Image from public domain licenseThe moon on cloudy blue sky photography. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3301528/free-photo-image-space-moon-and-blue-sky-astronomyFree Image from public domain licensePeter Mere Latham. Stipple engraving by F. Holl after G. Richmond. https://www.rawpixel.com/image/14001749/peter-mere-latham-stipple-engraving-holl-after-richmondFree Image from public domain licenseBalthasar Glass. Line engraving by C. Romstet after J. Sommer. https://www.rawpixel.com/image/13989619/balthasar-glass-line-engraving-romstet-after-sommerFree Image from public domain licenseHenry M. Phillips by James Earle McClees and Julian Vannerson https://www.rawpixel.com/image/14316676/henry-phillips-james-earle-mcclees-and-julian-vannersonFree Image from public domain licenseThe head of a boy with a skin disease of the scalp. Coloured lithograph by W. Bagg, 1847. https://www.rawpixel.com/image/13959353/image-face-person-artFree Image from public domain licenseEpistolae physiologicae super compluribus naturae arcanis; ubi variorum animalium atque plantarum fabrica, conformatio… https://www.rawpixel.com/image/13991016/image-cartoon-face-personFree Image from public domain licenseFrançois Xavier Swediaur [Schwediauer, Swediar]. Lithograph by Langlumé after L. Lorin. https://www.rawpixel.com/image/14009011/image-cartoon-face-personFree Image from public domain licenseErmolao Barbaro. Line engraving attributed to Theodore de Bry. https://www.rawpixel.com/image/13972402/ermolao-barbaro-line-engraving-attributed-theodore-bryFree Image from public domain licenseJohn Hunter. Stipple engraving by T. Wright after Sir J. Reynolds, 1786. https://www.rawpixel.com/image/14019613/john-hunter-stipple-engraving-wright-after-sir-reynolds-1786Free Image from public domain licenseSir Samuel Garth. Stipple engraving by W. Read after Sir G. Kneller. https://www.rawpixel.com/image/13990630/sir-samuel-garth-stipple-engraving-read-after-sir-knellerFree Image from public domain licenseThe Hellespontic sibyl. Engraving by D. Cunego after G. Magnani after G.F. Barbieri, il Guercino. https://www.rawpixel.com/image/13993669/image-cartoon-face-personFree Image from public domain licenseAdam Sedgwick. Lithograph by J. H. Lynch after S. Laurence, 1844. https://www.rawpixel.com/image/13993613/adam-sedgwick-lithograph-lynch-after-laurence-1844Free Image from public domain licenseWhale jumping in the ocean. Original public domain image from Flickr https://www.rawpixel.com/image/3392519/free-photo-image-marine-life-alaska-animalFree Image from public domain licenseFireworks above courthouse building, USA. Free public domain CC0 photo. https://www.rawpixel.com/image/6030112/photo-image-new-year-public-domain-celebrationFree Image from public domain licenseRed Ruffed Lemur (2018) by Roshan Patel. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3060362/free-photo-image-lemur-amazing-animalFree Image from public domain licenseJames Cook. Line engraving by C. Frosch after Sir N. Dance-Holland, 1776. https://www.rawpixel.com/image/13994901/james-cook-line-engraving-frosch-after-sir-dance-holland-1776Free Image from public domain licenseA scientist, posed with his microscope, in a drawing room setting. Photograph by Elliott and Fry. https://www.rawpixel.com/image/13969250/photo-image-face-plant-peopleFree Image from public domain licenseSir Robert Christison. Lithograph by Fr. Schenck after W. Stewart. https://www.rawpixel.com/image/13996195/sir-robert-christison-lithograph-fr-schenck-after-stewartFree Image from public domain license