la ciencia de la mecánica debe preceder al Libro de los inventos útiles.—¡Haz encuadernar tus libros de anatomía! > [Footnote: 4. The numerous notes on anatomy written on loose leaves and now in the Royal collection at Windsor can best be classified in four Books, corresponding to the different character and size of the paper. When Leonardo speaks of 'li tua libri di notomia', he probably means the MSS. which still exist; if this hypothesis is correct the present condition of these leaves might seem to prove that he only carried out his purpose with one of the Books on anatomy. A borrowed book on Anatomy is mentioned in F.O.]
8.
El orden de vuestro libro debe proceder según este plan: primero las vigas simples, luego