The buildings immediately without the walls of Rome, which were connectedly continued so as to merit the name of suburbs, were certainly of vast extent; and with those of the town itself, must have contained a prodigious number of people. By a calculation made by Mr. Byres, the Circus Maximus was of sufficient size to accommodate three hundred and eighty thousand spectators; and we are told by the Latin poets, that it was usually full. Now if allowance is made for the superannuated, the sick, and infirm; also for children, and those employed in their private business, and for slaves, who were not permitted to remain in the Circus during the games; Mr. Byres imagines that such a number as three hundred and eighty thousand spectators could not be supplied by a city and suburbs the number of whose inhabitants were much under three millions. Whatever may have been the extent of the suburbs of Rome, it is probable they were only formed of ordinary houses, and inhabited by people of inferior rank. There are no remains of palaces, or magnificent buildings of any kind, to be now seen near the walls, or indeed over the whole Campania; yet it is asserted by some authors, that this wide surface was peopled, at one period, like a continued village; and we are told of strangers, who, viewing this immense plain covered with houses, imagined they had already entered Rome, when they were thirty miles from the walls of that city. Some of the seven hills on which Rome was built, appear now but gentle swellings, owing to the intervals between them being greatly raised by the rubbish of ruined houses. Some have hardly houses of any kind upon them, being entirely laid out in gardens and vineyards. It is generally thought, that two-thirds of the surface within the walls are in this situation, or covered with ruins; and, by the information I have the greatest reliance on, the number of the inhabitants at present is about one hundred and seventy thousand, which, though greatly inferior to what Rome contained in the days of its ancient power, is more than it has been, for the most part, able to boast since the fall of the Empire. There is good authority for believing that this city, at particular periods since that time, some of them not very remote, has been reduced to between thirty and forty thousand inhabitants. The numbers have gradually increased during the whole of this century. As it was much less expensive to purchase new ground for building upon, than to clear any ruins which, by time, had acquired the consistence of rock, great part of the modern city is built on what was the ancient Campus Martius.