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352 which was first laid out in the time of the Tarquins, and afterwards enlarged as the population of the capital increased, until it was capable of holding two or three hundred thousand spectators.

The Romans borrowed the plan of their theatres from the Greeks; their amphitheatres, however, were original with them. The Flavian Amphitheatre, known as the Colosseum, has already come under our notice (see p. 316). The edifice was 574 feet in its greatest diameter, and was capable of seating eighty-seven thousand spectators. The ruins of this immense structure stand to-day as "the embodiment of the power and splendor of the Roman Empire."

Aqueducts.—The aqueducts of ancient Rome were among the most important of the utilitarian works of the Romans. The water-system of the capital was commenced by Appius Claudius (about 313 B.C.), who secured the building of an aqueduct which led water into the city from the Sabine hills. During the republic four aqueducts in all were completed; under the emperors the number was increased to nineteen. The longest of these was about fifty-five miles in length. The aqueducts usually ran beneath the surface, but when a depression was to be crossed, they were lifted on arches, which sometimes were over one hundred feet high. These lofty arches running in long broken lines over the plains beyond the walls of Rome, are the most striking feature of the Campagna at the present time.

Thermæ, or Baths.—The greatest demand upon the streams of water poured into Rome by the aqueducts was made by the Thermæ, or baths. Among the ancients Romans, bathing, regarded at first simply as a troublesome necessity, became in time a luxurious art. Under the republic, bathing-houses were erected in considerable numbers. But it was during the imperial period that those magnificent structures to which the name of Thermae properly attaches, were erected. These edifices were among the most elaborate and expensive of the imperial works. They contained chambers for cold, hot, tepid, sudatory, and swimming baths;