I. The art of man is able to construct monuments far more permanent than the narrow span of his own existence; yet these monuments, like himself, are perishable and frail; and in the boundless annals of time his life and his labors must equally be measured as a fleeting moment. Of a simple and solid edifice it [Pg 6319] is not easy, however, to circumscribe the duration. As the wonders of ancient days, the Pyramids attracted the curiosity of the ancients: a hundred generations, the leaves of autumn, have dropped into the grave; and after the fall of the Pharaohs and Ptolemies, the Cæsars and caliphs, the same Pyramids stand erect and unshaken above the floods of the Nile. A complex figure of various and minute parts is more accessible to injury and decay; and the silent lapse of time is often accelerated by hurricanes and earthquakes, by fires and inundations. The air and earth have doubtless been shaken, and the lofty turrets of Rome have tottered from their foundations, but the seven hills do not appear to be placed on the great cavities of the globe; nor has the city in any age been exposed to the convulsions of nature which in the climate of Antioch, Lisbon, or Lima, have crumbled in a few moments the works of ages in the dust. Fire is the most powerful agent of life and death: the rapid mischief may be kindled and propagated by the industry or negligence of mankind; and every period of the Roman annals is marked by the repetition of similar calamities. A memorable conflagration, the guilt or misfortune of Nero's reign, continued, though with unequal fury, either six or nine days. Innumerable buildings, crowded in close and crooked streets, supplied perpetual fuel for the flames; and when they ceased, four only of the fourteen regions were left entire; three were totally destroyed, and seven were deformed by the relics of smoking and lacerated edifices. In the full meridian of empire, the metropolis arose with fresh beauty from her ashes; yet the memory of the old deplored the irreparable losses, the arts of Greece, the trophies of victory, the monuments of primitive or fabulous antiquity. In the days of distress and anarchy every wound is mortal, every fall irretrievable; nor can the damage be restored either by the public care of government or the activity of private interest. Yet two causes may be alleged, which render the calamity of fire more destructive to a flourishing than a decayed city. 1. The more combustible materials of brick, timber, and metals are first melted and consumed, but the flames may play without injury or effect on the naked walls and massy arches that have been despoiled of their ornaments. 2. It is among the common and plebeian habitations that a mischievous spark is most easily blown to a conflagration; but as soon as they are devoured, the greater edifices which have resisted or escaped are left as so many islands in a state of solitude and [Pg 6320] safety. From her situation, Rome is exposed to the danger of