Note 154 — THE FLAVIAN AMPHITHEATRE, COMMONLY CALLED THE COLOSSEUM.

Probably the aqueduct which passes there had a hole made in it; the same aqueduct goes on from this side of the building to the south-east end. This occurred again in 1874, and a steam engine had again to be employed. This passage, before it turns, goes in the direction of the castellum aquæ of the time of Alexander Severus, of which there are considerable remains between this point and the Cœlian. The specus of an aqueduct of the same period passes along between the Cœlian and the amphitheatre, near the surface of the ground; a portion of this was visible in 1874.