16 feet on the second, 10 feet on the third ; this forms a considerable offset on each stage ; the five piers of the first range of arcades were formed with salient angles or bees. The division of the arches on the first and second stories is the same ; the middle arch of the first range, under which the river passes, and which is the centre of the entire aqueduct, is70 feet in diameter three on each side are of smaller dimensions. All the arches ;

on the third range or story are equal, being 15 feet in diameter the piers of the first and ;

second series of arches are 15 feet in front ; those of the third range vary according to the diameter of the arches of the range beneath them, four arches of the third range

corresponding with the middle or water way of the lower story. As the two mountains forming the valley of Gardon are not of equal height at the points in the line of aqueduct, that on the left side of the river being lower than the level of the aqueduct, while the right side is more elevated, the conduit on one side is carried onwards by continuing the third range of arches, and on the other side, the range terminates in the side of the mountain.

The Pont du Garde is constructed entirely with hewn stone ; no rubble work is introduced even into the filling up of the piers, or spandrils of the arches. The masonry