The Emporium was to ancient Rome what the docks are to London and Liverpool. This great building formed three sides of a quadrangle, the fourth being open to the quay on the bank of the Tiber, with a zigzag path down the face of the cliff and surface of the quay. This was excavated by the Pontifical Government, under the direction of Baron Visconti. It was remarkably perfect; the walls against the cliff were faced with _opus reticulatum_ of the time of Hadrian, and a large number of blocks of valuable marbles were found here. A little further up the river an _amphora_ is cut in the wall of the quay, to indicate the place for landing wine and oil. The portion of the Emporium now remaining belongs to the portico or arcade. There are said to be extensive cellars under the other remains, forming a lower story of the buildings. A new quarter is in course of erection here. The Emporium, and the quay by the side of it, called the MARMORATA, or Marble Wharf, are situated at the lower end of the great Port of Rome for sea-going vessels, which port extended about half a mile up the river, with the Salaria, or Salt Wharf, near the middle of it. Above this, and nearly opposite the point where the Almo falls into the Tiber, a little below the Temple of Hercules, are several large stone corbels with holes through them, through which a pole was passed for the purpose of fastening a chain across the river for holding vessels against the force of the stream. There are similar corbels in the wall of the Marmorata for the same purpose, only these corbels are left plain; those at the upper end of the port are carved in the form of lions' heads of the early character called Etruscan. These corbels at the two ends mark the extent of the Port of Rome, made originally in the year 577 of Rome, and were discovered by Mr. J. H. Parker, C.B. _Regaining the main road, at a little distance we pass under an arch of the aqueduct which supplied the Emporium with water. It is called the_ ARCO DI S. LAZARO. _We next turn off to the right, and ascend_ MONS TESTACCIO, formed of fragments of earthenware, chiefly of amphoræ. We know from those remaining at Pompeii that the amphoræ which formed that branch of commerce were often six feet high. Great numbers of these got broken in landing, and all were thrown on this heap, as they were not allowed to be thrown into the Tiber. There is also said to have been a manufactory of amphoræ and other earthenware at this spot, many of the fragments found here being the refuse of a great manufactory. This is supposed to have been the great manufactory of earthenware for the city of Rome for several centuries; and this supposition may account for the enormous quantity of such refuse that has accumulated on the spot, so as to form a hill. Tombs proving its comparatively recent origin were discovered beneath it in the year 1696. It is 110 feet high, and surmounted by a cross. The view from the top is very fine. _Close by is the_