Labels:text | screenshot | font OCR: This page is considered the beginning of a compilation on water because of a note Leonardo wrote at the top: "10 sheets and 853 conclusions." A Even though Leonardo's descriptions of locations appear to be based on actual visits, in some cases he was indebted to the written accounts of others. The present page is a good example: Giovanni Villani's Historiae of 1348 is the source of Leonardo's account of the formation of the gap at the Gonfolina rock. Villani argued that the gap was artificially