If man has organs for breathing, for sight, for locomotion, for taking food, for digesting, for protection by house-building, by attack and defence, for reproduction and love and care of his young, you shall find all the same in the muskrat. There is a perfect correspondence . . .
We look into the world and find ourselves. The correspondence in structure has long been long known, and been explained in various ways: divine creation, evolution from a common ancestor. Whichever explanation we accept, the correspondence remains. It is not affected by our explanations.
This page is the commentary on page 18