1534. The Bridge of S. Francis, over one of the branches of the Anio that meet near the rocks before mentioned, above Subiaco. 1517. Remains of a great reservoir or _castellum aquæ_, of the time of Trajan, on the bank of the lake or loch before mentioned. The wall is faced with _opus reticulatum_, with layers of brick at intervals, the usual construction of the time of Trajan. 1518. The modern bridge, far below, and remains of the old high wall on which it is built, are seen under it; below are the cliffs of the third lake or loch, cut into a circular form. In the bed of the stream are large stones fallen from the wall or bar across the river. 1519. Remains of another _castellum aquæ_ above Subiaco, and the mouth of a cave connected with the aqueduct. 1555. _Specus_ of the Anio Novus cut in the cliff of the valley of the Anio. This is below the level of the great bar, and the water was forced to go through the _specus_ into Rome by the bar being higher than the _specus_. A modern winding road has now been cut here, and the rock has been in part cut away, shewing an opening into the _specus_, which is six feet high and two feet wide. Above is seen a tower and an embattled wall of the modern Villa Gori. 1516. Part of the _specus_ of Trajan, who repaired this aqueduct. The _specus_ is cut as a tunnel in the cliff, with a reservoir by the side of it. 1556. A view of the gorge in the mountains above Subiaco, where the three lakes are situated. 1536. A small lake at the source of the spring called Fons Novus Antoninianus, one of the sources of the Anio Novus. 1558. Cascade at the Paper Mill, on the site of a _piscina_ of the Anio Novus, above Subiaco. 1057. Arches of the bridges of the Marcia and Anio Novus, in the Valley of the Arches above Tivoli. 1052. Arch of the bridge on the Anio Novus, in the Valley of the Arches above Tivoli, with a medieval tower built upon it, forming one of the most picturesque objects in the neighbourhood of Rome. 1522. Specus of the Anio Novus below Tivoli, on the road to Garciano, called the Promenade, with openings into it, and an old tomb in front of it. This promenade is through an olive wood, and the roots of the olive trees run into many of the ruins. 1523. One side of a _castellum aquæ_ of the aqueduct above the road to Garciano, faced with _opus reticulatum_. 1529. A bridge across a valley that passes the road to Garciano. This bridge is above the road on the left, in the valley called the Arcinelli. 1531. Ponte de S. Antonio, a fine bridge for the aqueduct below Tivoli, across a gorge. It is seen from above looking down upon it, with the chapel of S. Antony at the end of it, and a medieval castle in the distance. The road for horses, and the remains of the _specus_ by the side of it, are here visible.