https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14009380![Martin Birrius. Line engraving by C. Hagen after himself.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djdXEyNXBqcnotaW1hZ2UuanBn.jpg)
![Martin Birrius. Line engraving by C. Hagen after himself.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djdXEyNXBqcnotaW1hZ2UuanBn.jpg)
Martin Birrius. Line engraving by C. Hagen after himself.
Martin Birrius. Line engraving by C. Hagen after himself.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use