Lofty arches, stately pillars, vaulted ceilings, seats
of solid silver, costly marbles inlaid with precious stones, were
exhibited in these buildings with the most lavish profusion.
20. The aqueducts for supplying the city with water, were still more
worthy of admiration; they were supported by arches, many of them a
hundred feet high, and carried over mountains and morasses that might
have appeared insuperable. The first aqueduct was erected by Ap'pius
Clo'dius, the censor, four hundred years after the foundation
of the city; but under the emperors there were not less than twenty of
these useful structures, and such was the supply of water, that rivers
seemed to flow through the streets and sewers. Even now, though only
three of the aqueducts remain, such are their dimensions that no city
in Europe has a greater abundance of wholesome water than Rome.
21. The Cloa'cae, or common sewers, attracted the wonder of the
ancients themselves; the largest was completed by Tarquin the Proud.
The innermost vault of this astonishing structure forms a semicircle
eighteen Roman palms wide, and as many high: this is inclosed in a
second vault, and that again in a third, all formed of hewn blocks of
pepenno, fixed together without cement.
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