CAVE OF AQUEDUCTS,
a large stone quarry, intersected in all directions by aqueducts. Some of them are cut out of the solid tufa, others built in passages cut through the tufa; some are blocked up with mud deposit, others with stalactite; some run for a considerable distance, others being broken in, in extracting the tufa. They present altogether a curious and interesting study.
Opposite S. Prisca, in the vineyard of Prince Torlonia, are remains of the