Cavaliere Piacentini has discovered (1879), on his farm at Prima Porta, the remains of some baths, which probably were connected with Livia's Villa of the Hens. In the centre is a hemicycle, 29 feet in diameter, the mosaic of which represents circus races, the victor receiving the palm of victory for his horse Liber; and the three chariots racing, Romano, Ilarinus, and Olympio. Surrounding this hall are twelve others, with mosaic pavements of festoons and geometrical patterns in _chiaro-oscuro_. One pavement, 26 feet by 20 feet, represents the sea, in which are numerous fish; while upon the sea three-winged figures gambol with marine monsters. The boilers for hot water, furnaces for hot air, and pipes for cold water are in a capital state of preservation. Brick stamps show that the building was restored as late as the time of King Theodoric. Near the bridge over the Fosso di Prima Porta has been found the circular tomb of Gellius, the freedman of the Emperor Tiberius. _The road straight on from the Ponte Molle_, VIA CASSIA, _leads to_ VEII. (_Mr. Forbes's carriage excursion-lecture at frequent intervals._) _Turn off to the right beyond_ LA STORTA, _at the tenth mile_, FOR CARRIAGES; _pedestrians turn off at the fifth mile, near the_ TOMB OF VIBIUS MARIANUS, VIA VEIENTINA. The site of Veii is surrounded by two streams, the Cremera and the Fosso de'due Fossi, and is about twelve miles from Rome. The place was captured after a ten years' siege by the Romans under Camillus, B.C. 393. _Descend from the village of_ ISOLA, by the side of the brook, to the mill; here the torrent forms a picturesque cascade, 80 feet high, crossed by the ancient Ponte dell' Isola, with a single arch spanning 22 feet. Here was one of the ancient gates, called Porta de' Sette Pagi. _Opposite_ Isola, down the stream, is the Porta dell' Arce. Under the rock of Isola are some mineral springs, and another gate, Porta Campana. In the ravine _beyond_ was the Porta Fidenate. _The gates on the other side of the city_ may be traced by _ascending_ the valley of the Cremera, Porta di Pietra Pertusa; _beyond which_, on the ancient road outside, is a large tumulus, La Vaccareccia. Porta Spezzeria is higher up, with the remains of a tufa bridge; near by are the remains of an Etruscan columbaria.[20] Beyond is Porta Capenate, under which is Ponte Sodo, a tunnel, 240 feet long, 15 feet broad, and 20 feet high, cut in tufa for the brook to pass through. Further on is Porta del Colombario, near a ruined columbaria. _Beyond_ is the Ponte di Formello, a Roman bridge upon Etruscan piers; _close by_ is the last gate, Porta Sutrina. The so-called Piazza d'Armi, the ancient citadel, stands at the junction of the two streams.