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

Nerva. Augustus caused all of them to be repaired.

Procopius reckons only fourteen Aqueducts in ancient Rome ; but Victor has enlarged the number to twenty.

Frontinus, a man of consular dignity, and who had the direction of the queducts under the Emperor Nerva, mentions nine. From other accounts we are informed that nine great Aqueducts existed at Rome at the commencement of the reign of Nerva. Five others were constructed by that Emperor, under the superintendence of Julius Frontinus ;

and it appears that at a later period the number amounted to twenty.

Frontinus, who had the superintendence of the Roman Aqueducts under the Emperor Nerva, died A. D. 101. He gave an account of the Aqueducts, which has since been translated into French by Rondolet. The following table is made up of data from that work.

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The table is arranged to show, First, the name of the water or Aqueduct ; Second, the era of its construction Third, the length of each Aqueduct in miles and decimals Fourth, the cubic feet discharged in 24 hours, and Fifth, the gallons in wine measure.