A Treatise on Painting

by da Vinci Leonardo

[ [i17] Lomazzo, Trattato della Pittura, p. 282.

[ [i18] Vasari, 23. Du Fresne.

[ [i19] Venturi, 37.

[ [i20] Du Fresne.

[ [i21] Venturi, 36.

[ [i22] Du Fresne.

[ [i23] Vasari, 30. Lettere Pittoriche, vol. ii. p. 184.

[ [i24] Venturi, 3.

[ [i25] Suppl. to Life of L. da Vinci, in Vasari, 65. Du Fresne.

[ [i26] Venturi, 36; who mentions also, that Leonardo at this time constructed a machine for the theatre.