Begun at Milan on the l2th of September 1508.
[Footnote: No. 1528 and No. 1529 belong to the same year. The text Vol. I, No. 4 belongs to the following year 1509 (1508 old style); so also does No. 1009.— Nos. 1022, 1057 and 1464 belong to 1511.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.