Begun by me, Leonardo da Vinci, on the l2th of July 1505.
[Footnote: Thus he writes on the first page of the MS. The title is on the foregoing coversheet as follows: Libro titolato disstrafformatione coe (cioe) d’un corpo nvn (in un) altro sanza diminuitione e acresscemento di materia.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.