In many large houses there is a bath, generally too small to have been used by more than one person at a time. These baths ordinarily include only a tepidarium and a caldarium, but occasionally there is an apodyterium, less frequently still a small frigidarium; in most cases a basin in the apodyterium or tepidarium must have been used for the cold bath. The heating arrangements are similar to those found in the public baths, and more or less complete according to the period in which the bath was fitted up, and the taste of the proprietor; a progressive refinement in the appointments of the private baths can be traced similar to that which we have already noted in the case of the Stabian Baths. The close relation generally existing between the bath-rooms and the kitchen is well illustrated in the houses of the Faun and of the Silver Wedding. In connection with this group of rooms we may mention the storerooms, which are found in various parts of the houses and may be identified by the traces of the shelves that were fastened to the walls. Comparatively few houses were provided with cellars. In the house of the Centenary, however, there are two. One, entered from the atrium by a stairway, extends under the tablinum and the front colonnade of the peristyle; the other is accessible from a side atrium and is divided into several rooms, in one of which is the oven mentioned above. The cellar belonging to the house of Caecilius Jucundus is under the garden; that of the villa of Diomedes will be described later. X. THE SHRINE OF THE HOUSEHOLD GODS In ancient Italy each household worshipped its guardian spirits and tutelary divinities, which formed a triple group, the Lares, the Penates, and the Genius. In Pompeii the remains associated with domestic worship are numerous and important. Many Pompeians painted representations of the household gods upon an inner wall, often upon a wall of the kitchen, near the hearth. There was usually a painted altar underneath, with a serpent on either side coming to partake of the offerings. In a large number of houses a small niche was made in the wall, in which were placed little images of the gods, the Lares and the Genius being also painted on the back of the cavity or on the wall at the sides or below. Such a niche may be seen in a corner of the kitchen in the house of Apollo (Fig. 126); the pictures of the gods are almost obliterated, but that of the serpent--in this case there is but one--and of the altar can be clearly seen. In front is a small altar of masonry; the ferns and grasses with which the floor is carpeted make this kitchen in summer an attractive nook. Sometimes the niches were ornamented with diminutive half-columns or pilasters at the sides and a pediment above.