https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13972310Edit ImageSaveSaveEditCropCustom TextThe Penny magazine of the Society for the Diffusion of Useful Knowledge.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 1068 px | 300 dpiLarge JPEG 1458 x 1298 px | 300 dpiFree DownloadThe Penny magazine of the Society for the Diffusion of Useful Knowledge.More