Each of the roads which lead out of Rome--since the railway came, there is practically only one way which leads into Rome--has its own special interest, and the Salarian way is certainly not inferior to the Cassian or the Flaminian. We leave the city by that which in its material fabric is the most modern, which in its associations is perhaps the most historic, of all the gates of Rome. The Salarian gate in the wall of Aurelian may be looked at as in some sort drawing to itself the memories of the neighbouring Colline gate in the wall of Servius. He who fought before the Colline gate, he who entered by the Colline gate, could hardly fail to march over the ground where in the new system of defence the Salarian gate was to arise. The Colline gate on the high ground of the Quirinal hill was the weakest point of Rome; it was therefore specially strengthened in the Servian line of defence. It was the point by which most of the early invaders of Rome marched in or strove to march in. There the revolted troops entered to put down the tyranny of the decemvirs; there the Gauls came in after the slaughter of the Allia; to that gate Hannibal drew near, and those who did not understand Hannibal said that he hurled his spear over it. Before the Colline gate Rome had for the last time to struggle for the dominion of Italy in the fight between Sulla and Pontius Telesinus. And when the Colline gate had given way to the Salarian, it was at the new entrance to Rome that the enemy came in whose coming declared that her political dominion over the world had ceased, but that her moral dominion was stronger than ever. "At midnight the Salarian gate was silently opened, and the inhabitants were awakened by the tremendous sound of the Gothic trumpet." And if these gates were a centre of fighting, they were also, in a strange and special way, a centre of burying. Along this road, as along others, we mark the broken tombs here and there, two pre-eminently just outside the present gate; but this quarter supplies one strange contrast in the matter of burials which is not to be found elsewhere. Outside the Colline gate was the living tomb of unchaste vestals; not far beyond the Salarian we come to the Christian _cœmeterium Priscillae_. We go on; we descend the hill, the northern slope of the Quirinal, and find ourselves in the alluvial ground of Tiber and Anio. We have now come near to the meeting of the streams; Anio is spanned by a bridge which at first sight might seem to be wholly a thing of yesterday, but which in truth has lived and gone through much from the earliest times to the latest. Broken down and rebuilt over and over again, from the wars of Narses to those of Garibaldi, its main arch is indeed of the newest workmanship; but if we go down to the banks we see the smaller side arches, which must have been ancient when they were crossed by Hannibal, perhaps hardly new when they were crossed by Cossus. A few steps further, and we come