To avoid this^it was brought from the mountains, excluding all communication with the waters of the country through which it passed, and where it became necessary to pass the deep valley in which the river Garden runs, it was conducted across that valley by a bridge of two stages of arcades, at a height of 150 feet above the ordinary level of the river, that is, measuring to the top of the second range of arcades, which perfected Agrippa's erection, the water being conducted on the top of the second arcade. The third story, part of which is now remaining, raised upon a range of arcades, has been thought to be a building of a very different age from the two main ranges, in its materials, in its structure, and proportions and even in the placing of its parts, it does not correspond with the old ;

original bridge on which it was erected. The style of the architecture is also said to be very different, and very inferior to the rest. Although an adventitious addition, it is clearly Roman work, probably of a much later age.

The length of this aqueduct, as far as discovered, is about six French leagues, or 15 miles, in a direction resembling a horse-shoe, and derives its water from the spring of Eure, and Airau, near the village of Uzes. The Pont du Garde is in the middle of its course the greater part of the ancient line can now be traced, and much of what ;