99. ROMAN ARCHITECTURE AND SCULPTURE
THE ARCH AND DOME IN ROMAN BUILDINGS
In architecture the Romans achieved preëminence. The temples and other public works of Greece seem almost insignificant beside the stupendous edifices raised by Roman genius in every province of the empire. The ability of the Romans to build on so large a scale arose from their use of vaulted constructions. Knowledge of the round arch passed over from the Orient to the Etruscans and from them to the Romans. [33] At first the arch was employed mainly for gates, drainage sewers, aqueducts, and bridges. In imperial times this device was adopted to permit the construction of vast buildings with overarching domes. The principle of the dome has inspired some of the finest creations of ancient and modern architecture.
ROMAN USE OF CONCRETE AND RUBBLE
The Romans for many of their buildings made much use of concrete. Its chief ingredient was pozzolana, a sand found in great abundance near Rome and other sites. When mixed with lime, it formed a very strong cement. This material was poured in a fluid state into timber casings, where it quickly set and hardened. Small pieces of stone, called rubble, were also forced down into the cement to give it additional stability. Buildings of this sort were usually faced with brick, which in turn might be covered with thin slabs of marble, thus producing an attractive appearance.
TEMPLES
The triumphs of Roman architecture were not confined chiefly to sacred edifices. Roman temples, indeed, are mostly copies from the Greek. In comparison with their originals, they lack grace and refinement. There is less accuracy in the masonry fitting and far less careful attention to details of construction. A frequent departure from Greek models is found in the restriction of the rows of pillars to the front of the building, while the sides and rear are lined with "engaged" columns to give the idea of a colonnade. [34] More characteristically Roman are vaulted temples, such as the Pantheon, [35] where the circular dome is faced with a Greek portico.
BASILICAS
Roman basilicas, of which only the ruins are now in existence, were once found in every city. These were large, lofty buildings for the use of judges and merchants. The chief feature of a basilica was the spacious central hall flanked by a single or double row of columns, forming aisles and supporting the flat roof. At one end of the hall was a semicircular recess—the apse—where the judges held court. This arrangement of the interior bears a close resemblance to the plan of the early Christian church with its nave, choir (or chancel) and columned aisles. The Christians, in fact, seem to have taken the familiar basilicas as the models for their places of worship.
[Illustration: PLAN OF THE ULPIAN BASILICA
The hall measured 360 feet in length and 180 feet in width.]