[Calculate] the measurement of Milan and Suburbs [Find] a book that treats of Milan and its churches, which is to be had at the stationer’s on the way to Cordusio [Discover] the measurement of Corte Vecchio (the courtyard in the duke’s palace). [Discover] the measurement of the castello (the duke’s palace itself) Get the master of arithmetic to show you how to square a triangle. Get Messer Fazio (a professor of medicine and law in Pavia) to show you about proportion. Get the Brera Friar (at the Benedictine Monastery to Milan) to show you De Ponderibus (a medieval text on mechanics) [Talk to] Giannino, the Bombardier, re. the means by which the tower of Ferrara is walled without loopholes