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Describe the various forms of the intestines of the human species,
of apes and such like. Then, in what way the leonine species differ,
and then the bovine, and finally birds; and arrange this description
after the manner of a disquisition.
Miscellaneous notes on the study of Zoology (818-821).
8
18.
Procure the placenta of a calf when it is born and observe the form
of the cotyledons, if their cotyledons are male or female.
8
19.
Describe the tongue of the woodpecker and the jaw of the crocodile.
8
20.
Of the flight of the 4th kind of butterflies that consume winged
ants. Of the three principal positions of the wings of birds in
downward flight.
[Footnote: A passing allusion is all I can here permit myself to
Leonardo's elaborate researches into the flight of birds. Compare
the observations on this subject in the Introduction to section
XVIII and in the Bibliography of Manuscripts at the end of the
676
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