ARA INCENDII NERONIANI. In the month of July, A. D. 65, half Rome was destroyed by the fire of Nero. The citizens, overwhelmed by the greatness of the calamity, and ignorant of its true cause, made a vow for the annual celebration of expiatory sacrifices, on altars expressly constructed for the purpose in each of the fourteen regions of the metropolis. The vow was, however, forgotten until Domitian claimed its fulfilment some twenty or twenty-five years later. One of these altars, which adjoined Domitian's paternal house on the Quirinal, has just been found near the church of S. Andrea del Noviziato, in the foundations of the new "Ministero della Casa Reale." The altar, six metres long by three wide, built of travertine with a coating of marble, stands in the middle of a paved area of considerable size. The area is lined with stone cippi, placed at an interval of two and a half metres from one another. The following inscription has been found engraved on two of them: "This sacred area, marked with stone cippi, and enclosed with a hedge, as well as the altar which stands in the middle of it, was dedicated by the emperor Domitian in consequence of an unfulfilled vow made by the citizens at the time of the fire of Nero. The dedication is made subject to the following rules: that no one shall be allowed to loiter, trade, build, or plant trees or shrubs within the line of terminal stones; that on August 23 of each year, the day of the Volkanalia, the magistrate presiding over this sixth region shall sacrifice on this altar a red calf and a pig; that he shall address to the gods the following prayer (text missing)." The inscription has been read twice: once towards the end of the fifteenth century, when the cippus containing it was removed to S. Peter's and made use of in the new building, and again in 1644, when Pope Barberini was laying the foundations of S. Andrea al Quirinale, one of the most graceful and pleasing churches of modern Rome. * * * * *