The lower range has nineteen arches, the middle twenty-seven, and the upper one forty-three; makin 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 much smaller, and are arranged so that tier are three of them come within the space occupied by one of the lower arches.