A second demonstration inserted between anatomy and [the treatise on] the living being.
You will represent here for a comparison, the legs of a frog, which have a great resemblance to the legs of man, both in the bones and in the muscles. Then, in continuation, the hind legs of the hare, which are very muscular, with strong active muscles, because they are not encumbered with fat.
[Footnote: This text is written by the side of a drawing in black chalk of a nude male figure, but there is no connection between the sketch and the text.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.