The Da Vinci Notebooks
A spring may be seen to rise in Sicily which at certain times of the year throws out chesnut leaves in quantities; but in Sicily chesnuts do not grow, hence it is evident that that spring must issue from some abyss in Italy and then flow beneath the sea to break forth in Sicily. 585
248:585 : The chesnut tree is very common in Sicily. In writing cicilia Leonardo meant perhaps Cilicia.