u. Via Sacra.

v. Summa Sacra Via.

x. Proposed Drain, for turning off the water of this spring from the Colosseum.

y. Branch of an existing subterranean drain under the Via di S. Gregorio, between the Cœlian and the Palatine.

z. Excavation made in 1876 in the Vigna Rappini, in consequence of a land-slip; but nothing was found beyond an old quarry of tufa, at a great depth, and a branch of an aqueduct at nearly the same depth, the water having come originally from the spring in the cave (?) or quarry (?) called a vivarium.

THE AQUEDUCTS.
PLATE XXI.

SECTIONS OF THE SPECUS OF EACH OF THE FIFTEEN AQUEDUCTS OF ROME.

XXI.

SECTIONS OF THE SPECUS OF EACH OF THE 15 AQUEDUCTS OF ROME