Few events of the last century were more influential upon the progress of knowledge than the chance discovery of the buried cities, since it nourished a curiosity respecting the past which could not be confined to those excavations, and which has since been disclosing antiquity in every quarter of the globe. We call it a chance discovery, although the part which accident plays in such matters is more interesting than important. The digging of a well in 1708 let daylight into the amphitheatre of Herculaneum, and caused some languid exploration, which had small results. Forty years later, a peasant at work in a vineyard five miles from the same spot struck with his hoe something hard, which was too firmly fixed in the ground to be moved. It proved to be a small statue of metal, upright, and riveted to a stone pedestal, which was itself immovably fastened to some solid mass still deeper in the earth. Where the hoe had struck the statue the metal showed the tempting hue of gold, and the peasant, after carefully smoothing over the surface, hurried away with a fragment of it to a goldsmith, intending (so runs the local gossip) to work this opening as his private gold mine. But as the metal was pronounced brass, he honestly reported the discovery to a magistrate, who set on foot an excavation. The statue was found to be a Minerva, fixed to the centre of a small roof-like dome, and when the dome was broken through it was seen to be the roof of a temple, of which the Minerva had been the topmost ornament. And thus was discovered, about the middle of the last century, the ancient city of Pompeii, buried by a storm of light ashes from Vesuvius sixteen hundred and seventy years before. [Illustration: Roman Masks, Comic and Tragic.] It was not the accident, but the timeliness of the accident, which made it important; for there never could have been an excavation fifteen feet deep over the site of Pompeii without revealing indications of the buried city. But the time was then ripe for an exploration. It had become possible to excite a general curiosity in a Past exhumed; and such a curiosity is a late result of culture: it does not exist in a dull or in an ignorant mind. And this curiosity, nourished and inflamed as it was by the brilliant and marvelous things brought to light in Pompeii and Herculaneum, has sought new gratification wherever a heap of ruins betrayed an ancient civilization. It looks now as if many of the old cities of the world are in layers or strata--a new London upon an old London, and perhaps a London under that--a city three or four deep, each the record of an era. Two Romes we familiarly know, one of which is built in part upon the other; and at Cairo we can see the process going on by which some ancient cities were buried without volcanic aid. The dirt of the unswept streets, never removed, has raised the grade of Cairo from age to age. [Illustration: A Roman Comic Actor masked for the Part of Silenus.]