1. ARCHITECTURE.

GREEK ORIGIN OF ROMAN ARCHITECTURE: THE ARCH.—The architecture of the Romans was, in the main, an imitation of Greek models. But the Romans were not mere servile imitators. They not only modified the architectural forms they borrowed, but they gave their structures a distinct character by the prominent use of the arch, which the Greek and Oriental builders seldom employed, though they were acquainted with its properties. By means of it the Roman builders vaulted the roofs of the largest buildings, carried stupendous aqueducts across the deepest valleys, and spanned the broadest streams with bridges that have resisted all the assaults of time and flood to the present day.

SACRED EDIFICES.—The temples of the Romans were in general so like those of the Greeks that we need not here take time and space to enter into a particular description of them. Mention, however, should be made of their circular vaulted temples, as this was a style of building almost exclusively Italian. The best representative of this style of sacred edifices is the Pantheon at Rome, which has come down to our own times in a state of wonderful preservation. This structure is about 140 feet in diameter. The great concrete dome which vaults the building, is one of the boldest pieces of masonry executed by the master-builders of the world.

CIRCUSES, THEATRES, AND AMPHITHEATRES.—The circuses of the Romans were what we should call race-courses. There were several at Rome, the most celebrated being the Circus Maximus, 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.

[Illustration: THE ROMAN FORUM IN 1885]

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 fourteen. [Footnote: Several of these are still in use.] 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 Thermæ 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; dressing-rooms and gymnasia; museums and libraries; covered colonnades for lounging and conversation, extensive grounds filled with statues and traversed by pleasant walks; and every other adjunct that could add to the sense of luxury and relaxation. Being intended to exhibit the liberality of their builders, they were thrown open to the public free of charge.

MEMORIAL ARCHITECTURE.—Among the memorial structures of the Romans, their triumphal arches are especially characteristic. These were modelled after the city gates, being constructed with single and with triple archways. Two of the most noted monuments of this character, and the most interesting because of their historic connections, are the Arch of Titus (see p. 315) and the Arch of Constantine, both of which are still standing. The Arch of Constantine was intended to commemorate the victory of that emperor over his rival Maxentius, which event established Christianity as the imperial and favored religion of the empire.

[Illustration: ARCH OF CONSTANTINE.]