In Latium too, during the first century and a half of the republic, it is probable that they moved solely in the previous track, and it has already been stated that the exercise of art rather sank than rose with the introduction of the republic.(32) There can scarcely be named any Latin building of architectural importance belonging to this period, except the temple of Ceres built in the Circus at Rome in 261, which was regarded in the period of the empire as a model of the Tuscanic style. But towards the close of this epoch a new spirit appeared in Italian and particularly in Roman architecture;(33) the building of the magnificent arches began. It is true that we are not entitled to pronounce the arch and the vault Italian inventions. It is well ascertained that at the epoch of the genesis of Hellenic architecture the Hellenes were not yet acquainted with the arch, and therefore had to content themselves with a flat ceiling and a sloping roof for their temples; but the arch may very well have been a later invention of the Hellenes originating in more scientific mechanics; as indeed the Greek tradition refers it to the natural philosopher Democritus (294-397). With this priority of Hellenic over Roman arch-building the hypothesis, which has been often and perhaps justly propounded, is quite compatible, that the vaulted roof of the Roman great -cloaca-, and that which was afterwards thrown over the old Capitoline well-house which originally had a pyramidal roof,(34) are the oldest extant structures in which the principle of the arch is applied; for it is more than probable that these arched buildings belong not to the regal but to the republican period,(35) and that in the regal period the Italians were acquainted only with flat or overlapped roofs.(34) But whatever may be thought as to the invention of the arch itself, the application of a principle on a great scale is everywhere, and particularly in architecture, at least as important as its first exposition; and this application belongs indisputably to the Romans. With the fifth century began the building of gates, bridges, and aqueducts based mainly on the arch, which is thenceforth inseparably associated with the Roman name. Akin to this was the development of the form of the round temple with the dome-shaped roof, which was foreign to the Greeks, but was held in much favour with the Romans and was especially applied by them in the case of the cults peculiar to them, particularly the non-Greek worship of Vesta.(37) Something the same may be affirmed as true of various subordinate, but not on that account unimportant, achievements in this field. They do not lay claim to originality or artistic accomplishment; but the firmly-jointed stone slabs of the Roman streets, their indestructible highways, the broad hard ringing tiles, the everlasting mortar of their buildings, proclaim the indestructible solidity and the energetic vigour of the Roman character. Plastic and Delineative Art