This Aqueduct was commenced in 1753. It is twenty- seven miles long, from the sources which supply it to the gardens of Caserta. The sources are at the base of the mountain called Taburno; the principal one is called Sor- gente de la Sfizzo; it is afterwards joined by streams from many other sources, which are in the country called Airola. These waters are all joined in one Aqueduct, crossing the river Faenza, upon a bridge of three arches, built in 1753. Again, in the valley of Durazzano, there is another bridge of three arches, upon which the Aqueduct crosses the valley, passing over the river, and extending from the mountain called Santa Agata de'Goti, to the mountain of Duraz- zano. 31 This Aqueduct afterwards crosses a deep valley, which it meets between Monte-Longano and the hills Tifata, where ancient Caserta is situated, about the place called Monte di Gazzano. The crossing of this valley required the most important of all the constructions connected with the work. It was accomplished by an Aqueduct bridge, 1724 feet long and 190 feet in height, composed of three tiers of arches, one above another. The lower range has nineteen arches, the middle twenty-seven, and the upper one forty-three; mak- in all eighty-nine arches. The labor of constructions under ground for this Aque- duct was more than that above; it pierced through five hills or mountains, making an aggregate length of tunnel of about four miles, and most of this was through rock. To give air and light to the channel, they made pits or wells ; some of which were 250 feet deep, 10 feet diameter at the bottom, and 4 at the top. Aqueduct Bridge of Castellana. This Aqueduct was built in connection with an ancient Causeway, which led to Civita- Castellana. This Causeway was about 820 feet long and 32 feet wide; the greatest height was about 130 feet. It was pierced in the middle of this extent, by nine large arches ; three of which were 86 feet span, and the others were each 64 feet span. Above these arches of the bridge the Aqueduct is built, the 32 height of which is about 57 feet, and it is sustained upon a series of arches of about 19 feet span each. Aqueduct of Montpelier. This Aqueduct is one of the most beautiful works of the kind, which exist in France. The length is about 3,200 feet ; it conducts to Montpelier the waters of Saint Clement and du Boulidou. It was built by M. Pitot, engineer and member of the Academy of Sciences. He was thirteen years constructing it. This Aqueduct is formed by two ranges of arches ; those in the lower tier are seventy in number, and each 28 feet span ; the piers of these arches are each 12 feet thick. The arches of the second or upper tier are much smaller, and are arranged so that three of them come within the space occupied by one of the lower arches. They are 9 feet diameter ; their piers are 4 feet and a quarter thick. The greatest height of this Aqueduct is 90 feet. It is constructed entirely of cut stone. The quantity of water furnished by it is about 300,000 gallons in twenty-four hours. Aqueduct of Spoleto. This Aqueduct was constructed in the year 741, by Theo- doric, King of the Goths, to communicate with the town of Spoleto, situated upon the summit of a mountain. It is s f= U.] 33 composed of ten grand Gothic arches each 71 feet diameter, supported upon piers of 10^- feet thickness. The middle arches which are over the river de la Morgia, are about 328 feet high. On the top of this bridge is the Aqueduct which carries the water to Spoleto. This structure was difficult to execute, and being built of a very hard stone, remains entire at the present day. The total length is 800 feet, and the breadth is 44 feet. The greatest height of this bridge is 420 feet. Aqueduct of the Prince of Biscari. This Aqueduct was constructed by the Prince of Biscari, in Sicily, at his own expense, across the river Saint-Paul, the ancient Symete. It conducts a pure stream of water to the estate of the prince, and at the same time serves as a public bridge over the valley. This bridge is composed of thirty-one arches, the largest of which, over the river, is 90 feet span. This arch is of Gothic form, while all the others are semi-circular. The bridge has two tiers or ranges of arches ; the roadway is upon the first range, and the channel for the water, upon the second or upper range. The length of the bridge is 269 feet. The height to