The soil cleared out in the passage, dens, galleries, and area was found to be composed of mud deposited during a flood or floods by the Tiber, the composition of which may still be seen in parts of the long passage not yet cleared. The most remarkable of these floods, which lasted some days and did immense damage to the city, were those of A.D. 555, 590, 725, 778, 1476, 1530, 1557, and 1598.

We may presume, from the nature of the soil, that at some early date, probably A.D. 555, one of those terrible floods reached the Colosseum, and on the waters retiring a great deposit of mud was left, covering the old area floor and filling up the various passages and galleries, and that the authorities, instead of clearing out this deposit, added to it to make a solid floor, and used the arena above; for after that date we have no record of its being used, with the exception of the bull-fight.

By applying to the custodian, the visitor can ascend to the top, where a most magnificent view is enjoyed, the only way to get a good idea of its size and oval shape, and where the construction of the upper galleries can be studied. It will be seen that the arches forming the tiers of seats have at some date been filled in with brickwork, of the time of Alexander Severus and the Gordiani. The water-courses for keeping the building cool in hot weather can also be traced. The highest wall of all, the inside brick casing of which is partly gone, is built of fragments evidently not originally intended for the purpose for which they are used, corresponding to a great extent with the construction of the walls upon the area.

The Colosseum was for a long time used as a quarry, from which several of the palaces in Rome were built.

Should the visitor be fortunate enough to see the ruin under moonlight, or when it is illuminated with Bengal lights, he will see it in its grandeur, for "it will not bear the brightness of the day."

SECTION OF SEATS AND ARCHES OF THE COLOSSEUM.
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RAMBLE II.