It is represented by Pliny, as the

most beautiful of all that had been built for the use of Rome. It was begun by Caligula, and finished by Claudius, who brought its waters from two springs called Coeruleus and Curtius. Vespian, Titus, Marcus - Aurelius, and Antonius Pius, repaired and extended it ; it is now called Aqua, Felice.

The Aqueduct that conveyed the Aqua Neroniana to Rome, was built of brick this, as well as the former, was ;

in some instances 70 Roman feet high.

The Aqueduct that brought the Aqua Marcia into the city was repaired by Agrippa, who laid pipes from it to

several parts of the city.

The Aqua Marcia, Aqua Julia, Aqua Tepula, entered Rome in one and the same Aqueduct, divided into three ranges or stories ; in the uppermost of which flowed the Aqua Julia, in the second the Aqua Tepula, and in the lowest the Aqua Marcia. This accounts for the extraordinary

height of this Aqueduct, which far surpassed that of any other in Rome. From the ruins of this fabric, which are still seen, and are called " II castel del Acqua Marcia," it appears to have been a very superb structure.

The Aqueducts were under the care and direction, first of the censors and cediles, and afterwards, of particular magistrates called " Curatores Aquarum," instituted by Agrippa,

to whom the Aqueducts of Rome were objects of particular attention. Messala was one of these curatores in the reign of Augustus, and Frontinus held the same office in that of