being salt, if it had really boiled it would have been more. As nearly as I could estimate, the water here is at the level of the sea. The baths of Nero are close by, consisting of a large vaulted chamber cut in the rock, with some preparation for baths. I then came to the Lago Lucrino, famous now, as formerly, for its oysters, and swarming with fish, but it has been much diminished in size by the eruption of Monte Nuovo. We pass along a lane, and through vineyards to the left, to the grotto of the Sybil, that at Cuma being her town-house, and this her country residence; here are a long gallery passing through a subordinate hill, several chambers, and a bath with stone beds, where the vaults and walls are covered with mosaics; all these rooms have about 18 inches of water in them. The path afterwards ascends till it reaches a brick archway, at which we stare with wonder, as its situation seems perfectly unaccountable. It perhaps formed the original entrance, but at present all direct communication with the day is prevented by the earth which fills up the farther part. All this is very near the lake of Avernus. Close on its banks are the remains of a large domed room called the Temple of Apollo, or of Proserpine; behind it are several small chambers. What it was, I cannot tell, the fragments here are so numerous that the attempt to determine their names seems a hopeless task. My guide had been contending with me very strenuously, that the hot water of the stufe of Tritola, proceeded from the Solfatara passing by a natural channel under the sea. As I was walking leisurely back along the shore, he desired me to put my hand into the sea, I did so mechanically, and started back on finding both the sand and the water quite hot; this was a great triumph for him, for he considered his position to be perfectly proved. Nearer to Pozzuoli are the bases of a range of columns in the sea; they are in a straight line, and apparently horizontal, so that they do not give the idea of having slipt from their original position, but rather of an elevation in the level of the sea: this is not so mysterious as the circumstances of the columns of the temple of Serapis, but even with these smaller things, it is difficult to hit upon any theory which will consistently explain all the phenomena, and to save trouble we cut the knot and say that the ground has been heaved or depressed by the action of subterraneous fires. On approaching to Pozzuoli we discern, projecting from an angle of the hill on which the city stands, the remains of a mole which inclosed the ancient port. It consists of brick arches, the springing of which is below the usual level of the sea, and it is this circumstance probably which has obtained for it the popular name of the bridge of Caligola. It must have been a noble work, and is evidently a Roman one; once consisting, as we are told, of twenty-five arches, of which we may perhaps now make out traces of thirteen.