"Presbyter, Card. Successor quisquis fueris, rogo te, per gloriam Dei, et per merita horum martyrum, nihil demito, nihil minuito, nec mutato; restitutam antiquitatem pie servato; sic Deus martyrum suorum precibus semper adjuvet!" The chancel is raised and surrounded by an inlaid marble screen. Instead of ambones there are two plain marble reading-desks for the epistle and gospel. The altar is inlaid, and has "transennæ," or a marble grating, through which the tomb of the saints Nereus and Achilles may be seen, and through which the faithful might pass their handkerchiefs to touch it. Behind, in the semicircular choir, is an ancient episcopal throne, supported by lions, and ending in a gothic gable. Upon it part of the twenty-eighth homily of St. Gregory was engraved by Baronius, under the impression that it was delivered thence,--though it was really first read in the catacomb, whence the bodies of the saints were not yet removed. All these decorations are of the restoration under Leo III., in the eighth century. Of the same period are the mosaics on the arch of the tribune (partly painted over in later times), representing, in the centre, the Transfiguration (the earliest instance of the subject being treated in art), with the Annunciation on one side, and the Madonna and Child attended by angels on the other. It is worth while remarking that when the relics of Flavia Domitilla (who was niece of Vespasian) and of Nereus and Achilles were brought hither from the catacomb on the Via Ardeatina, which bears the name of the latter, they were first escorted in triumph to the Capitol, and made to pass under the imperial arches which bore as inscriptions: "The senate and the Roman people to Sta. Flavia Domitilla, for having brought more honour to Rome by her death than her illustrious relations by their works." ... "To Sta. Flavia Domitilla, and to the Saints Nereus and Achilles, the excellent citizens who gained peace for the Christian republic at the price of their blood." Opposite, on the left, is a courtyard leading to the _Church of S. Sisto_, with its celebrated convent, long deserted on account of malaria. It was here that St. Dominic first resided in Rome, and collected one hundred monks under his rule, before he was removed to Sta. Sabina by Honorius III. After he went to the Aventine, it was decided to utilize this convent by collecting here the various Dominican nuns, who had been living hitherto under very lax discipline, and allowed to leave their convents, and reside in their own families. The nuns of Sta. Maria in Trastevere resisted the order, and only consented to remove on condition of bringing with them a Madonna picture attributed to St. Luke, hoping that the Trasteverini would refuse to part with their most cherished treasure. St. Dominic obviated the difficulty by going to fetch the picture himself at night, attended by two cardinals, and a bare-footed, torch-bearing multitude.