were the chief subjects of Leonardo's studies of the sea, did not exclusively claim his attention. * A few passages have been collected at the beginning of this section, which prove that he had turned his mind to the practical problems of navigation, and more especially of naval warfare. * What we know for certain of his life gives us no data, it is true, as to when or where these matters came under his consideration; but the fact remains certain both from these notes in his manuscripts, and from the well known letter to Ludovico il Moro (No.* 1340_), in which he expressly states that he is as capable as any man, in
- Las numerosas notas sobre las leyes y la razón del vuelo