Similarities of the embryos of a human and a dog, fig 1 p. 10, part I of The Descent of Man by Charles Darwin, London, John Murray, 1875

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Similarities of the embryos of a human and a dog, fig 1 p. 10, part I of The Descent of Man by Charles Darwin, London, John Murray, 1875. Wellcome Collection. Source: Wellcome Collection.