1. City treasury. 2. Latrina. 3, 4. Market buildings.] This building is divided into three parts, one of which, that furthest north, at the corner, contains both lower and upper rooms. Below, at the level of the Forum, are two dark vaulted chambers, one at the rear of the other. The front chamber is dimly lighted by a slit in the ceiling and was entered from the Forum by a narrow door; there are traces of a strong iron grating in the doorway. It has been supposed, not without probability, that these were the vaults of the city treasury, the aerarium; if they had been built for prison cells, they would naturally have had separate entrances. Above these chambers are two rooms which open not on the Forum, but on the street that runs past them on the north (1, 1). They resemble shops and would be classed as such without further question but for the fact that the level of the floor is nearly five feet above the sidewalk, so that they could have been reached only by means of steps. If the identification of the chambers below as the vaults of the city treasury is correct, these rooms must have been occupied by the treasury officials, who could here transact business with the public without admitting the latter to their offices. The middle room (2) was a public closet, with a small anteroom. As the doors to and from the anteroom were not placed opposite each other, the interior was not visible from the street. The room was not entirely finished; nevertheless, we can see the water channel running along three sides, and above it the stones on which the woodwork was to be placed; the inlet pipe was in position, as well as the outlet for carrying the water off into a sewer at the rear. The last of the three parts of the building (3) is by far the largest. It was a high and spacious hall, with numerous entrances from the Forum. It was divided into two rooms by two short sections of wall projecting from the sides, and was evidently a market house, perhaps for vegetables and farm products. The rooms formed by enclosing the small colonnade at the rear of the court of Apollo have already been mentioned (p. 62). At the left of the stairway leading to the second story (shown in Plan II) is a small room which opens in its entire breadth upon the Forum (11). Close by is a recess (10), also open toward the Forum, in the side of the first of the thick pillars which separate the Forum from the court of the temple.