Like most of the other houses at Pompeii, it had no vestibulum according to the meaning given above. 1. The _ostium_ or entrance-hall, which is six feet wide and nearly thirty long. Near the street-door there is a figure of a large fierce dog worked in mosaic on the pavement, and beneath it is written _Cave Canem_. The two large rooms on each side of the vestibule appear from the large openings in front of them to have been shops; they communicate with the entrance-hall, and were therefore probably occupied by the master of the house. 2. The _atrium_, which is about twenty-eight feet in length and twenty in breadth; its _impluvium_ is near the centre of the room, and its floor is paved with white tesserae, spotted with black. 3. Chambers for the use of the family, or intended for the reception of guests, who were entitled to claim hospitality. 4. A small room with a staircase leading up to the upper rooms. 5. _Alae._ 6. The _tablinum_. 7. The _fauces_. 8. Peristyle, with Doric columns and garden in the centre. The large room on the right of the peristyle is the triclinium; beside it is the kitchen; and the smaller apartments are cubicula and other rooms for the use of the family.--Having given a general description of the rooms of a Roman house, it remains to speak of the (1) floors, (2) walls, (3) ceilings, (4) windows, and (5) the mode of warming the rooms. For the doors, see JANUA.--(1.) The floor (_solum_) of a room was seldom boarded: it was generally covered with stone or marble, or mosaics. The common floors were paved with pieces of bricks, tiles, stones, &c., forming a kind of composition called _ruderatic_. Sometimes pieces of marble were imbedded in a composition ground, and these probably gave the idea of mosaics. As these floors were beaten down (_pavita_) with rammers (_fistucae_), the word _pavimentum_ became the general name for a floor. Mosaics, called by Pliny _lithostrota_ (λιθόστρωτα), though this word has a more extensive meaning, first came into use in Sulla’s time, who made one in the temple of Fortune at Praeneste. Mosaic work was afterwards called _Musivum opus_, and was most extensively employed.--(2.) The inner walls (_parietes_) of private rooms were frequently lined with slabs of marble, but were more usually covered by paintings, which in the time of Augustus were made upon the walls themselves. This practice was so common that we find even the small houses in Pompeii have paintings upon their walls.--(3.) The ceilings seem originally to have been left uncovered, the beams which supported the roof or the upper story being visible. Afterwards planks were placed across these beams at certain intervals, leaving hollow spaces, called _lacunaria_ or _laquearia_, which were frequently covered with gold and ivory, and sometimes with paintings. There was an arched ceiling in common use, called CAMARA.--(4.) The Roman houses had few windows (_fenestrae_). The principal apartments, the atrium,