Building apparently perfect in time of Bede, 27; —made part of fortress of Frangipani, A.D. 1130, 28; —half given to Annibaldi by Frederick II., grant rescinded by Innocent IV. in A.D. 1244, _ib._; —much damaged by an earthquake, A.D. 1349, _ib._; —made common property as a stone-quarry, A.D. 1362, 29; —several palaces made out of this quarry, _ib._ Calpurnius mentions _pegmata_ in amphitheatre, 49. Canals brought to light in 1812 and 1875, with substructures, 10; —great cisterns under boards, 14; about 10 ft. deep, but not always the same width, _ib._; —walls to support unusually thick, _ib._; —lined with lead, one on arches, the other on beams of wood, _ib._ Capitals fallen from upper gallery, 21. Capstans, sockets for, 7. CAPUA, Amphitheatre almost the same size as that of Rome, 40; —Substructures more perfect, _ib._; —Aqueduct and drain, _ib._; —Remains of aqueduct, 13; —Dens under the _podium_, 40; —Sockets for pivots for cages, _ib._; —Arena of brick, not wood, but apertures for trap-doors, _ib._; —Grooves for covers over them to make them water-tight, _ib._; —Building of the time of Hadrian, _ib._; —Inscription, 41; —Machine for lifting vessels, as in the Colosseum, 47. Castra Misenatium, for sailors employed in furling awning, or _vela_, or _velaria_, 24. Catadromus, cords for awning, 48. Cavea, name for an amphitheatre, 3; and for vaults under it, 51. Chambers, narrow and lofty vaulted, on each side of central passage, 38. Circensian games, name retained in amphitheatre, 51. Circus Maximus, sometimes used instead of amphitheatre, 50. Claudian mentions _pegmata_ in amphitheatre, 49. Clivus Scauri, Arcade to this amphitheatre, 3. Colossus visible from gulf in amphitheatre, 49. Columns and capitals fallen from upper gallery on to arena, and into _cavea_, 21. Commodus, acts of, in this building, described by Dion Cassius, 22. Comparison and construction, 40; —one of the first principles of archæology, _ib._; —especially useful for this amphitheatre, _ib._ Construction, here made visible by demolition of outer corridor, 30. Corbels or brackets for placing boards of arena upon, 11, 36. Corridors, open channels for running water, in amphitheatre, 11; —water supplied by aqueducts, _ib._ Cradle, or dry-dock, in central passage, 18, 38. Culprits executed by being thrown to wild beasts in this amphitheatre, 3. Dens under the _podium_ have arches of Neronian brickwork, 12; —small stream of water in front of them, 17. Drain, large, under passage, 35, and in Appendix, 56, 59; ancient iron grating at mouth of, 36; place for flood-gates visible, _ib._ Emperors went to see wild beasts fed, 55. Evidence of construction, and comparison, 40.