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; making in all eighty-nine arches. The labor of constructions under ground for this Aqueduct 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 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 Theodoric, King of the Goths, to communicate with the town of Spoleto, situated upon the summit of a mountain. It is composed of ten grand Gothic arches each 71 feet diameter, supported upon piers of 10½ feet thickness. The middle arches which are over the river _de la Morgia_, are about 328 feet high. [Illustration: _Napoleon Gimbrede. sc._ AQUEDUCT OF SPOLETTO, ITALY.] On the top of this bridge is the Aqueduct which carries the water to Spoleto.