CHAP. 48. (14.)—FORMACEAN WALLS.
And then, besides, have we not in Africa and in Spain
of earth, known as "formaceoan" walls? from the fact
that they are moulded, rather than built, by enclosing earth
within a frame of boards, constructed on either side. These
walls will last for centuries, are proof against rain, wind, and
fire, and are superior in solidity to any cement. Even at this
day, Spain still beholds watch-towers that were erected by
Hannibal, and turrets of earth2
placed on the very summits of
her mountains. It is from the same source, too, that we derive
the substantial materials so well adapted for forming the
earth-works of our camps and embankments against the impetuous
violence of rivers. What person, too, is unacquainted
with the fact, that partitions are made of hurdles coated with
clay, and that walls are constructed of unbaked bricks?