supposed to occupy the site of the house, some remains of which can be seen in the crypt, in which she was baptized by S. Peter. Only open on January 18. Supposed to have been formerly the site of the Temple of Diana founded by Servius Tullius. _Down the hill, and up the opposite one, leads to the_ CHURCH OF S. SABA, built on the site of the house of Silvia, the mother of Gregory the Great, who used to send every day to her son on the Cœlian a silver basin containing soup. Uninteresting, and only open on the saint's day, December 5. _At the foot of the hill, on the left corner of the two roads, is the_ 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_ WALL OF THE LATINS, built by the Latins under Ancus Martius, when he added the Aventine to the city. The cliff has been scarped to the depth of 60 feet, and a terrace made on the ledge on which the wall stands, consisting of blocks of tufa. It was originally 12 feet thick, and in one part an arch is introduced for catapults, similar to those we have seen in ruins on the Palatine. The back of this part of the wall is a mass of concrete backing. At the foot of the wall was a trench, afterwards filled up, in which deep wells have been made for interments. Under the hill of S. Saba, below the cottage opposite, are traces of another early fortification formed of masses of concrete, originally faced with large blocks of tufa. The road here ran through the Porta Randusculana, in the fortifications of the seven hills. _In this vineyard are also some remains of_ THE BATHS OF SURA, cousin of Trajan. These remains have only been partly explored, and are of great extent. _On the opposite side of the road, in another vineyard_, are some massive remains of the aqueduct and reservoir of these baths, from the top of which there is a most enjoyable view of the city in general and the Palatine in particular. "Sura, the neighbour of the Aventine Diana, beholds at less distance than others the contests of the great circus" (Martial, vi. 64). _In this vineyard are also some remains called the_ HOUSE OF AQUILA AND PRISCILLA. It consists of some chambers of reticulated work and a well of the early empire; the latter extends under S. Prisca. "Greet Priscilla and Aquila my helpers in Christ Jesus.... Likewise greet the church that is in their house" (Rom. xvi. 3, 5).