which, having followed up, they came to a copidus supply of water. In a little temple built on the spot, a picture is suspended, commemorating the event. The springs thus found were surrounded with a brick wall, and in their course augmented by several small streams, and the united waters were carried to Rome by an aqueduct of about fourteen miles, of which about three-fourths of a mile are above ground, and one half of the distance on arches.

The Aqua Alsietina is the next in order. Itwas brought to Rome by Augustus, from whom it was frequently called Augusta. It was derived from a lake of the same

name, about fourteen miles from Rome, and conveyed to the city by an aqueduct twentytwo and one-fifth miles in length, of which 358 paces were on arches. As its waters were neither salubrious nor grateful to the taste, it is conjectured that the object of Augustus in

introducing them was to supply the Naumachice, and thus spare the more wholesome waters when, however, by reason of repairs to the other aqueducts, the supply was ;

interrupted, recourse was had to the Alsietina.

This was the water-course, afterwards adjusted by Trajan, into which he introduced a new stream from the lake Sabbatinus, now the Lago Bracciano, and then the name of Alsietina was changed to Sabbatina. It is now the Aqua Paola, and supplies the fountains of St. Peter's and the Vatican. Some remains of the original work of Augustus (as is most probable,) may be seen without the Porta S. Pancrazio, in going towards the Villa Pamfili Doria.*