It was now evident that the whole structure, over a breadth of several
yards, had been either weakly and carelessly built, or had at some
former period suffered a sudden and violent shock. He left the stick in
the wall to mark the place; and was about to retire, when he heard the
footstep of the sentinel on the rampart immediately above. Suddenly
cautious, though from what motive he would have been at that moment
hardly able to explain, he remained in the concealment of the trees and
bushes, until the guard had passed onward; then he cautiously emerged
from the place; and, retiring to some distance, fell into a train of
earnest and absorbing thought.
To account to the reader for the phenomenon which now engrossed the
Pagan's attention, it will be necessary to make a brief digression to
the history of the walls of Rome.
The circumference of the first fortifications of the city, built by
Romulus, was thirteen miles. The greater part, however, of this large
area was occupied by fields and gardens, which it was the object of the
founder of the empire to preserve for arable purposes, from the
incursions of the different enemies by whom he was threatened from
without.
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