https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13979931Edit ImageSaveSaveEditCropCustom TextOptics: microscopy, including a magnified title page and a specimen holder. Engraving by Barlow.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 919 x 1200 px | 300 dpiLarge JPEG 2379 x 3108 px | 300 dpiFree DownloadOptics: microscopy, including a magnified title page and a specimen holder. Engraving by Barlow.More