always fell back upon its first principles, so that its life became ever more noble and more vigorous. Afterwards, people begin to check and to keep down what is fresh rising up, and then life is thrown back, and the seeds of decay are first sown. Signs of this evil already show themselves a hundred years before the Gracchi; it breaks out in their time, and from thence goes on increasing for forty years, until it gives birth to the Social War, and that of Sylla and Marius, out of which the people comes forth as a confused mass, being no more able to subsist in republican unity, and necessarily wanting an absolute authority to guide them. One might exactly tell how Rome could have become young again, and have kept up for some hundreds of years longer. The good path lay open; but people were blinded by selfish and besotted prejudice, and they tried when too late to follow it. With regard to the gradual increase of the city there exist very contradictory opinions, which in the common topographies, as for instance that of Nardini, cause the most confused chaos. Yet this may be set to rights. It should be born in mind that the views which have influenced these statements are manifold. The statement of one set is that a hill was built upon under such or such a king; of another, that it had been taken into the town; and of a third, that those who dwelt on it had obtained the freedom of the city. The result of my researches is as follows. Old Rome was situated on the Palatine: the Pomœrium of Romulus mentioned in Tacitus, which ran from the Forum Boarium through the Circus as far as to the Septizonium, S. Gregorio, the arch of Constantine, the Thermæ of Titus, and from thence back through the Via Sacra by the temples of Venus and Roma,--even the whole of this circuit is a suburb built around the old city, and surrounded, not by walls, but by a rampart and ditch. At that time there was on the Quirinal and the Tarpeian rocks the Sabine town, which likewise had its Pomœrium: between the two ramparts and ditches a road ran along,--the Via Sacra. On this stood the Janus Quirini, a gateway which was _bifrons_, turned on one side towards the Roman and on the other towards the Sabine town; closed in times of peace, because it was not then wished that there should be any intercourse between the two cities; open in war, as both towns were in a league, and bound to give support to each other. A case quite analogous to this is to be found in the Gætulian town of Ghadames beyond Tripoli: the place is inhabited by two hostile tribes, and is divided by a wall into two parts, which are connected by a gate; likewise closed in peace, and open during war.[79] As for the Cælius, some say that Romulus; others, that Tullus Hostilius; others, that Ancus Marcius added it to the city. The key to which is this; that under Ancus the hill, already inhabited before, was connected with the town by a ditch, the _fossa Quiritium_, from the old moat of