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. They are 9 feet diameter their piers are ;

4 feet and a quarter thick.

The greatest height of this Aqueduct is 90 feet.

It is constructed entirely of cut stone. The quantity of water furnished by it is about 300,000 gallons in twenty-four hours.

Aqueduct of Spoleto.

This Aqueduct was constructed in the year 741, by Theodoric, King of the Goths, to communicate with the town of Spoleto, situated upon the summit of a mountain. It is

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composed of ten grand Gothic arches each 71 feet diameter, supported upon piers of 10^- feet thickness. The middle arches which are over the river de la Morgia, are about 328 feet high.

On the top of this bridge is the Aqueduct which carries the water to Spoleto.

This structure was difficult to execute, and being built of a very hard stone, remains entire at the present day.

The total length is 800 feet, and the breadth is 44 feet.

The greatest height of this bridge is 420 feet.