The Da Vinci Notebooks at sacred-texts.com
Pl. LXXIX, 1. and 2, (MS. B, 37b, see No. 745, and MS. B. 36a, see No. 746). A Plan for streets and canals inside a town, by which the cellars of the houses are made accessible in boats.
The third text given under No. 747 refers to works executed by Leonardo in France.