is on the site of a temple to Ceres and Proserpine. "Spurius Cassius consecrated the Temple of Ceres, Bacchus, and Proserpine, which stands at the end of the great circus, and is built over the starting-places, and which Aulus Postumius, the dictator, had vowed when upon the point of engaging the Latins," A.U.C. 258 (Dionysius, vi. 94). "It was restored by Augustus, and consecrated by Tiberius" (Tacitus, "Annals," ii. 49). The temple fronted north, and in the left-hand aisle of the church are three of the columns of the portico _in situ_; three of the side columns are in the portico of the church, and three others in the sacristy, where there is part of a mosaic from old S. Peter's, A.D. 705. In the portico is a large mask of stone called the Bocca della Verità (Mouth of Truth). A suspected person, on making an affirmation, was required to put his hand in the mouth of this mask, in the belief that if he told an untruth the mouth would close upon his hand. Several columns of the old temple are immured in the walls, and the aisles are formed by twenty ancient marble columns; the pavement is of beautiful _opus Alexandrinum_. _Behind_ the altar is a fine bishop's chair, and a Greek picture of the Virgin and Child, also some old frescoing behind a panel on the left. _Opposite_ the church is a beautiful fountain of Tritons supporting a basin. _Resuming our ramble down the_ VIA MARMORATA, _turn left coming out of the church, passing under_ an archway, the remains of the Porta Trigemina in the Servian Wall. _The road runs for a short distance by the Tiber, on the opposite side of which is the_ RIPA GRANDE, _or quay. Taking the road to the right, past a stone-yard, Marmorata, by the river, brings us to_ THE EMPORIUM, another important building of the time of the Republic, of which we have considerable remains. The exact date of its foundation is not recorded, but a porticus, or arcade, was made to it, and it was paved about the year 560 of Rome, or 193 B.C. It was the great warehouse for the port of Rome for merchandise brought by vessels coming from the sea. There was another port at the Ripetta for provisions brought _down_ the river in boats.