of Chioggia have been completely destroyed, and fever is a frequent visitor in the towns of the littoral. There can be no doubt that but for the efforts of the Venetian engineers the lagoons of the Lido, Malamocco, and Chioggia would long ago have been converted into dry land. Venice has at all times been alive to the necessity of preserving its precious inland sea. The Venetian engineers were not content with turning aside the torrents which formerly poured their waters into the lagoons; they have also, by means of canals, moved the mouths of the Sile and Piave to the east, thus securing the ports of the Lido from the dreaded alluvium of the rivers. They even conceived the gigantic project of a huge encircling canal for the interception of all the Alpine torrents between the Brenta and Isonzo. This project, however, has never been carried out. The débris carried southward by the coast current has silted up the port of the Lido, which was abandoned towards the close of the fifteenth century, when a new military port was constructed eight miles farther south, at the canal of Malamocco, and it is now protected by a pier extending 7,200 feet into the sea. The torrents which descend from the slopes of the Apennines to the south of the delta of the Adige and Po are as erratic in their course as those of Venetia. The Trebbia, the Taro, and other rivers irrigating the districts of Piacenza and Parma only cross a narrow plain between the mountains and the Po, and do not much modify the topography of the country. But this cannot be said of the rivers flowing through the vast plains of Modena, Bologna, Ferrara, and Imola. They are constantly changing their beds, and the remains of embankments met with all over the country prove that all efforts to confine them permanently have proved abortive. Modena itself was once destroyed by the floods of the Secchia. The Tanaro, the Reno, and other rivers flowing towards the north-west, either into the canal encircling the lagoons of Comacchio or direct into the sea, all have a history attached to them; they are blessed for their fertilising alluvium, cursed on account of their destructive floods. One of them, probably the Fiumicino, is the famous Rubicon which bounded the Italy of the Romans, and which was crossed by Cæsar when he pronounced the fatal words, “Alea jacta est.”