The principal feature of the Roman house was its large colonnaded hall, with a roof open in the middle to admit light and air. This roof sloped inwards, and allowed the rain to fall into a central tank, delightful for coolness, no doubt, but probably very unwholesome. In old days the atrium had been the common room of the Roman family. It still retained a symbolical marriage-bed, a symbolical spinning-wheel, the portraits of the ancestors, and the ceremonial altar to the family gods, who were now stored away in a cupboard close at hand. Most of the rooms opened directly out of the atrium. As they are seen in the ruins of Roman villas, they appear to have been comparatively small and ill-lighted. The larger houses themselves were generally built of local limestone with facings of stucco, though the greater part of Rome was still in this first century b.c. constructed of sun-baked bricks. It was considered unheard-of luxury when Mamurra faced his walls with marble slabs. The floors were generally tessellated. It was an innovation of the Roman architect to build houses of three or more stories, but it was probably only a starveling poet who would live on the fourth floor. A noble’s house would spread over the ground regardless of space, but the bedrooms and sometimes the dining-room were upstairs. Externally the Roman house was a little finer than the Greek, being fronted with a pillared forecourt and a dwelling for the concierge. At the back the atrium opened into a colonnaded garden with a fountain, flower-beds, and shrubbery. As the Roman’s house was built mainly with a view to coolness, so his daily life was that of a southerner. Rome was never a healthy city in the summer, and all who could afford it fled to the country or the sea-side. Almost every Roman known to us in literature was either an invalid or a valetudinarian. Malarial fever in its periodic form was very widely spread, and most of our distinguished friends pursued a medical regimen. Cæsar was subject to fits of epilepsy, Cicero was of weak constitution, Horace was a martyr to ophthalmia as well as malaria, Augustus was always ailing and often at death’s door. The Roman’s most amiable idiosyncrasy was his devotion to the bath. Every considerable house had an elaborate bathing department with at least a hot room built over a furnace, and a cold room with a swimming-tank. But there were also public baths, on an ever-increasing scale of magnificence. Agrippa alone built 170 of them at Rome. Rich and poor alike made it their daily practice to bathe after exercise, just before their principal meal in the early afternoon. The custom of the noon-tide siesta was universal, except with prodigies of industry like Cicero. A great deal of time was spent in lounging abroad through the streets or under shady colonnades. The streets of Rome, as of all ancient cities, were extremely narrow, but in the busy parts of the city all wheeled traffic was forbidden.