Figure of the eye: contrary apparent motion of images
A consequence the writer notes that experience does not confirm
A small fragment carries a figure of an eye with two lines converging from points on a bar down to the eye, labelled f n and g m. The note weighs a consequence of the inversion theory: if the motion from n to m appears contrary to that from g to f, then the motion from f to g should also appear contrary in the eye. Leonardo remarks that experience does not confirm this, and that further proofs are therefore needed.
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Contrary apparent motion of the image (f n, g m)
The note reasons that if motion from n to m seems contrary to motion from g to f, then motion from f to g must likewise appear contrary in the eye, that is from m to n. Since experience does not bear this out, Leonardo concludes that other proofs are needed.
Eye with two converging rays
A small figure of an eye is drawn at the right, with two straight lines running from points on a short bar down to a circular eye, marking the paths whose apparent motions the note compares.