Concave mirrors; philosophy of Aristotle;[Footnote 2: _Avicenna_
(Leonardo here writes it Avinega) the Arab philosopher, 980-1037,
for centuries the unimpeachable authority on all medical questions.
Leonardo possibly points here to a printed edition: _Avicennae
canonum libri V, latine_ 1476 _Patavis._ Other editions are, Padua
1479, and Venice 1490.] the books of Avicenna Italian and Latin
vocabulary; Messer Ottaviano Palavicino or his Vitruvius [Footnote
3: _Vitruvius._ See Vol. I, No. 343 note.]. bohemian knives;
Vitruvius[Footnote 6: _Vitruvius._ See Vol. I, No. 343 note.]; go
every Saturday to the hot bath where you will see naked men;

'Meteora' [Footnote 7: _Meteora._ See No. 1448, 25.],

Archimedes, on the centre of gravity; [Footnote 9: The works of
Archimedes were not printed during Leonardo's life-time.] anatomy
[Footnote 10: Compare No. 1494.] Alessandro Benedetto; The Dante of
Niccolo della Croce; Inflate the lungs of a pig and observe whether
they increase in width and in length, or in width diminishing in
length.

[Footnote 14: _Johannes Marliani sua etate philosophorum et
medicorum principis et ducalis phisic. primi de proportione motuum
velocitate questio subtilissima incipit ex ejusdem Marliani
originali feliciter extracta, M(ilano)_ 1482.

Another work by him has the title: _Marlianus mediolanensis. Questio
de caliditate corporum humanorum tempore hiemis ed estatis et de
antiparistasi ad celebrem philosophorum et medicorum universitatem
ticinensem._ 1474.] Marliano, on Calculation, to Bertuccio.
Albertus, on heaven and earth [Footnote 15: See No. 1469, 1. 7.],
[from the monk Bernardino]. Horace has written on the movements of
the heavens.

[Footnote: _Filosofia d'Aristotele_ see No. 1481 note.]