Two doors admit the visitor from the palaestra to the series of bath rooms, one of them opening from the north end of the colonnade. The first room (_i_, _l_) was designed to answer the purpose of a store, with four booths (_k_, _m_, _n_, _o_) opening into it for the sale of edibles and bathers' conveniences. The apodyterium (_p_), tepidarium (_q_), and caldarium (_s_) had each three large windows opening on the palaestra; two of those belonging to the tepidarium are seen in Fig. 95. None of the rooms were finished, though a hollow floor and hollow walls had been built in the tepidarium, caldarium, and Laconicum. The bath basins yet lacked their marble linings, and the two furnaces (at _x_ and _y_) had not been built. Five smaller windows on the southeast side of the caldarium looked out on a narrow garden, about which the workmen had commenced to build a wall to cut off the sight of the firemen passing to and fro between the two furnaces. The caldarium was so placed as to receive the greatest possible amount of sunlight, particularly in the afternoon hours, when it would be used; this was in accordance with a recommendation of Vitruvius, who says that the windows of baths ought, whenever possible, to face the southwest, otherwise the south. [Illustration: Fig. 95.--View of the Central Baths, looking from the palaestra into the tepidarium.] The contrast is indeed marked between the numerous large windows here, with their attractive outlook, and the small apertures, high in the walls and ceiling, through which light was admitted in the older baths. In the Central Baths there was no frigidarium; but a large basin for cold baths, nearly five feet deep, was placed in the dressing room opposite the windows. Supply pipes were so laid that jets would spring into the basin from three small niches, one in each wall; the overflow was conducted by pipes under the floor to a catch basin (_w_), and thence to the street. The tepidarium (_q_)--here, as usual, relatively small--is connected with the apodyterium by two doors, and similarly with the caldarium. The latter room has a bath basin at each end, thus affording accommodations for twenty-six or twenty-eight bathers at once; at the middle of the southeast side was a smaller basin that took the place of the labrum. The hot air flues leading from the furnaces under the bath basins were already built, and above them openings were left for semi-cylindrical heaters like that in the women's caldarium of the Stabian Baths. The round sweating room, Laconicum, was made more ample by means of four semicircular niches, and lighted by three small round windows just above the cornice of the domed ceiling. There was probably another round opening at the apex, designed for a bronze shutter, which could be opened or closed from below by means of a chain, so as to regulate the temperature. Doors led into the Laconicum from both the tepidarium and the caldarium.