The great amphitheatre at Capua is almost of the same size as the Colosseum in Rome, and a remarkably exact copy of it; some say that it was called by the same name, but this is rather doubtful, as persons who have resided at Capua for years say they have never heard it so called; the name is not of much importance: the plan and arrangements are identical, and although the superstructure has been almost entirely destroyed, the substructures at Capua are far more perfect than in Rome; and here we have the mouth of an aqueduct perfect in these substructures, and remains of canals for water, with the very massive walls to support them, exactly as in Rome. The great drain to carry off the water also remains, but on rather a different plan; instead of being carried under a low arch at the end of the great central passage, as in Rome, the water is conveyed into a large and deep well in the centre of the building, with four small channels running into it, beside the great central opening. From this well there is a large and deep drain leading to the river. There are the same dens for wild beasts under the _podium_, and in the pavement the same sockets for pivots to work in, to pull up the cages, or _pegmata_, or lifts. The arena, instead of being a boarded floor, is of brick, carried on vaults, with numerous square apertures for the trap-doors. The central passage is vaulted at the two ends, but open in the greater part. Round each of the openings there is a deep groove, as if a wooden cover had been fitted tightly over each and made water-tight, so that the surface of the arena might be flooded for naval fights; but there is reason to believe that only rowing-boats, drawing little water, were used in this instance, and not galleys. The earliest part of the building at Capua is of the time of the Emperor Hadrian, but only a small part of that period remains, as shewn by the construction (reticulated work with a framework of brick). Most of the walls in the substructure are faced with brick of the second or third century, with later repairs[193]. PUTEOLI OR POZZUOLI.