https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14013585![William Gregory. Stipple engraving by C. Cook.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djdms1ZnEydHktaW1hZ2UuanBn.jpg)
![William Gregory. Stipple engraving by C. Cook.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djdms1ZnEydHktaW1hZ2UuanBn.jpg)
William Gregory. Stipple engraving by C. Cook.
William Gregory. Stipple engraving by C. Cook.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use