13,) is visible to the present hour, (Douat.

Roma Vetus, l.i.c.17, p.

53, 54.)] The battlements or bastions were shaped in sharp angles a ditch, broad and deep, protected the foot of the rampart; and the archers on the rampart were assisted by military engines; the balistri, a powerful cross-bow, which darted short but massy arrows; the onagri, or wild asses, which, on the principle of a sling, threw stones and bullets of an enormous size.

[81] A chain was drawn across the Tyber; the arches of the aqueducts were made impervious, and the mole or sepulchre of Hadrian [82] was converted, for the first time, to the uses of a citadel.

That venerable structure, which contained the ashes of the Antonines, was a circular turret rising from a quadrangular basis; it was covered with the white marble of Paros, and decorated by the statues of gods and heroes; and the lover of the arts must read with a sigh, that the works of Praxiteles or Lysippus were torn from their lofty pedestals, and hurled into the ditch on the heads of the besiegers.