the Duke de Rohan, in order to make a passage for his artillery, perforated the piers of and by some other operations directed to the same end, the Pont du the second arcade, Garde was rapidly falling to pieces. Considerable rents in the walls, and deviations from the perpendicular, exciting public attention, the provincial States took the matter into consideration, and by a series of judicious repairs, they succeeded in restoring this ornament of Languedoc to the state in which it was, before the dilapidations of the Due de Rohan.

In 1746, the project of building a bridge near the site of this aqueduct was, fortunately for its further stability, modified so as to be built adjoining to it. M. Petot proposed to form this bridge on the eastern face of the Pont du Garde, and rigorously following the

32 PRELIMINARY ESSAY.

dimensions of the piers and arcades of the ancient aqueduct, this was shortly afterwards erected.

Aqueduct at Lyons. Nothing gives us a higher idea of the ancient splendor of the city of Lyons (Lugdunum,) under the emperors, than the remains of its ancient buildings, temples, palaces, amphitheatres, naumachias, baths, and, above all, its aqueducts, erected during the reigns of Augustus, Tiberius, and Claudius, to supply that part of the citywith water, which was situated on the heights. The oldest, that erected by the troops of Marcus Antoninus, drew its waters by two branches, from the group of hills, called in modern times, Mont d'Or : this stream having been found inadequate for the proper supply of even the highest division of the city, a second aqueduct was constructed, which drew its water from the Loire. The third aqueduct was formed under, to conduct water to the highest part of the city, on which was erected the palace built by the Emperor Claudius.