statement of Strabo, that the absence of fortifications round Rome was to be accounted for by the native spirit of the Romans, which was “to defend their walls by their men, and not their men by their walls,” is evidently full of meaning. II.--MONUMENTAL HISTORY. Relics of the two great public works executed during the regal period of Roman history still remain in the venerable stone arches of the main drain which was constructed to make the Forum valley more habitable, and in the rough portions of the Servian walls which have been found on the Aventine and Quirinal Hills. It is probable that the ruined walls at the edge of the Palatine are anterior to the monuments of the time of Servius. Of the earlier republican period of Roman history there are no monumental ruins now existing. The ruins which have been excavated on the Capitoline Hill and the basement of the Temple of Vesta in the Forum date from the regal epoch. And this is what might be naturally expected from the dislike of a republican government to require the forced labour anciently called for in the erection of large buildings. But in the later period of the Roman republic some of the oligarchical leaders and successful generals constructed large buildings, of which traces can now be found. Thus the foundations of the temples and of the portico built in the Campus Martius by Metellus Macedonicus and by Cn. Octavius can be still recognised, and ruins of the immense stone theatre of Pompeius Magnus remain to the present day. But the greater portion of the ruins of Rome dates from the Augustan age and the subsequent imperial ages. First among them stands the Pantheon, which has kept its roof and its original structure uninjured through the storms and earthquakes and the wasting hand of time during more than nineteen centuries. It bears the date of B.C. 27 on the frieze of its portico. The Theatre of Marcellus must be next mentioned, and the Mausoleum of Augustus. To the Julian dynasty may be also ascribed the colossal columns of the Temple of Mars Ultor, with the huge wall adjoining them, and the Egyptian obelisks which still decorate some of the piazzas. To the same dynasty we owe the vast arches of the Claudian aqueduct, and the massive brick foundation of the Palatine palace. [Illustration] [Illustration: ROMA ANTIQUISSIMA.] The Flavian dynasty, Vespasian, Titus, and Domitian changed the characteristic features of the city of Rome. Where Caligula and Nero had covered the ground with costly palaces and pleasure-grounds, the Flavian emperors built the resorts of military and of national life. The Coliseum and the Arch of Titus were the fit accompaniments of their world-subduing, blood-thirsty legions, and the Baths of Titus, and the public reception rooms on the Palatine, encouraged the citizen life of Rome once more to develop itself.