From the entrance of the church, through a long suburb, you trace the old Flaminian road till it crosses the Tiber at the Ponte Molle, the famous Milvian Bridge. It is strange to think of this hoary road of many memories being now laid down with modern tramway rails, along which cars like those in any of our great manufacturing towns continually run. This is one of the many striking instances in which the past and the present are incongruously united in Rome. You see on the right side of the road a picturesque ridge of cliffs clothed with shaggy ilexes and underwood, overhanging at intervals the walls and buildings. It was formed by lava ejected from some ancient volcano in the neighbourhood; and over it was deposited, by the action of acidulated waters rising through the volcanic rock, a stratum of travertine or fresh-water limestone. Not far off is a mineral spring called Acqua Acetosa, much frequented by the inhabitants on summer mornings, which may be considered one of the expiring efforts of volcanic action in the neighbourhood. The Milvian Bridge is associated with most interesting and important historical events. The Roman citizens, two hundred years before Christ, met here the messengers who announced the defeat of Asdrubal on the Metaurus at the end of the second Punic war. Here the ambassadors of the Allobroges implicated in Catiline's conspiracy were arrested by order of Cicero. And from the parapets of the bridge the body of Maxentius, the rival pagan emperor, was hurled into the Tiber, after his defeat by Constantine in the great battle of Saxa Rubra, which took place a little distance off. Visitors to the Vatican will remember the spirited representation of this battle on the walls of Raphael's Stanze, designed by the immortal master, and executed by Giulio Romano, the largest historical subject ever painted. By the tragic details of this battle, men and horses being entangled in the eddies of the river, the Christians were reminded of the destruction of Pharaoh and his host in the Red Sea, and the consequent deliverance of Israel. The victory on the side of Constantine led to the total overthrow of paganism, and put an end to the age of religious persecution. On this memorable day the seven-branched golden candlestick which Titus had taken from the temple of Jerusalem, according to tradition, was thrown into the Tiber, where it lies under a vast accumulation of mud in the bed of the river. It would thus seem as if the Jewish religion, too, of which the golden candlestick was the most expressive symbol, had come finally to an end in this triumph of Christianity. Of the monuments by which the great battle was commemorated one still survives near the Colosseum, the well-known triumphal arch of Constantine, which is at once a satire upon the decay of art at the time, and the halting of the new emperor between the two religions, containing, as it does, pagan figures and inscriptions mixed up incongruously with Christian ones.