https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13977700![Sir Joseph Dalton Hooker. Wood engraving by Butterworth & Heath after Whitlock [].](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djY3FzMjZwNWUtaW1hZ2UuanBn.jpg)
![Sir Joseph Dalton Hooker. Wood engraving by Butterworth & Heath after Whitlock [].](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djY3FzMjZwNWUtaW1hZ2UuanBn.jpg)
Sir Joseph Dalton Hooker. Wood engraving by Butterworth & Heath after Whitlock [].
Sir Joseph Dalton Hooker. Wood engraving by Butterworth & Heath after Whitlock [].
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use