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 the top is 120 feet. It is said that this magnificent structure was accomplished in two years. 9 34 Aqueduct of Arcueil. The Emperor Julian built this Aqueduct to bring water to Paris, A. D. 360 ; it supplied the palace and hot baths, but was destroyed by the Normans. It was above nine miles and a half long, and was entirely under ground, except the stone arcade over a deep valley at Arcueil. After its use had been suspended 800 years, a new and beautiful arched Aqueduct was built by the side of the ruins of the old one, and its final restoration to public use was completed in 1634. Part of this ancient construction, consisting of two arches substantially built, still exists, near the modern Aqueduct. The Aqueduct bridge over the valley of Arcueil has twenty- five arches, is 72 feet high and 1,200 feet in length. In the interior of the Aqueduct on each side is a parapet which forms a walk. On the outside along the whole line are various openings, called regards. This Aqueduct was thoroughly repaired in 1777 ; and fresh sums of money have lately been devoted to the same purpose by the city of Paris. It supplies 36,000 hogsheads daily. Aqueduct of Maintenon. This work, had it been completed, would have been one of the most remarkable of modern times. The project was one 35 of the noblest examples of the enterprise which characterized the reign of Louis XIV., and had it been carried out would have presented a work equal in grandeur to any of the kind constructed by the Romans. It was projected by Vauban, and the work was commenced in 1684, but was abandoned in 1688. It was intended to conduct water from the river Eura to Versailles ; a distance of over seventy miles ; and it was also contemplated to continue the work to St. Cloud and to Paris ; had this been done it would have been over ninety miles in length. It was intended to be of a mixed construc- tion ; partly by a canal formed by excavations and embank- ments, and partly by a channel of masonry. One of the most remarkable structures connected with it, was the Aqueduct bridge across the valley of Maintenon. This was designed to be entirely of masonry, having three ranges of arches, one above another. The length of this Aqueduct bridge would have been three and a quarter miles, and the height from the lowest part of the valley would have been 234 feet. The whole number of arches designed for this bridge was 685. Some of the piers and arches of the lower tier were con- structed, but have since been suffered to crumble and fall. Many deep valleys were filled with embankments, and the canal was completed for a portion of the distance, but the 36 course of the work is now but faintly marked by the remains of these structures. Aqueduct of Lisbon. The site of Lisbon, as well as the ground in its vicinity, consists chiefly of limestone and basalt, which render it ne- cessary to obtain good water, at about three leagues distance, for the beverage, and other uses of the inhabitants. The source consists of several springs that are near to the village of Bellas, and their produce is conveyed to Lisbon by an Aqueduct, constructed of a kind of white marble, and finished in 1738. In some parts its course has been excavated through hills ; but near to Lisbon it is carried over a deep valley, for a length of 2400 feet, by means of several bold arches, of which the largest has a height of about 250 feet, by a breadth of 115. The arches being pointed have an interesting aspect, particularly when viewed from below, the interior of the spacious vaults being not only majestic in appearance, but reverberating every sound. The water flows through a stone tunnel, or covered arch-way, about 8 feet wide, formed in the middle of the structure ; and on each side there is a foot-path, with a parapet wall, having a sufficient width for two persons to walk. The Aqueduct enters