Haeckel's Evolution of Man. This plate shows the embryos of four mammals in the three corresponding stages: of a Hog (H), Calf (C), Rabbit (R), and a Man (M). The conditions of the three different stages of development, which the three crossroads (I,II,III) represent, are selected to correspond as exactly as possible.

Public Domain Mark

You can use this work for any purpose without restriction under copyright law. Read more about this licence.

Credit

Haeckel's Evolution of Man. This plate shows the embryos of four mammals in the three corresponding stages: of a Hog (H), Calf (C), Rabbit (R), and a Man (M). The conditions of the three different stages of development, which the three crossroads (I,II,III) represent, are selected to correspond as exactly as possible. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.