nations, who gazed with astonishment, expected wars and calamities from their baleful influence; and these expectations were abundantly fulfilled. The astronomers dissembled their ignorance of the nature of these blazing stars, which they affected to represent as the floating meteors of the air; and few among them embraced the simple notion of Seneca and the Chaldeans, that they are only planets of a longer period and more eccentric motion. Time and science have justified the conjectures and predictions of the Roman sage: the telescope has opened new worlds to the eyes of astronomers; and, in the narrow space of history and fable, one and the same comet is already found to have revisited the earth in seven equal revolutions of five hundred and seventy-five years. The first, which ascends beyond the Christian æra one thousand seven hundred and sixty-seven years, is coeval with Ogyges, the father of Grecian antiquity. And this appearance explains the tradition which Varro has preserved, that under his reign the planet Venus changed her color, size, figure, and course; a prodigy without example either in past or succeeding ages. The second visit, in the year eleven hundred and ninety-three, is darkly implied in the fable of Electra, the seventh of the Pleiads, who have been reduced to six since the time of the Trojan war. That nymph, the wife of Dardanus, was unable to support the ruin of her country: she abandoned the dances of her sister orbs, fled from the zodiac to the north pole, and obtained, from her dishevelled locks, the name of the comet. The third period expires in the year six hundred and eighteen, a date that exactly agrees with the tremendous comet of the Sibyl, and perhaps of Pliny, which arose in the West two generations before the reign of Cyrus. The fourth apparition, forty-four years before the birth of Christ, is of all others the most splendid and important. After the death of Cæsar, a long-haired star was conspicuous to Rome and to the nations, during the games which were exhibited by young Octavian in honor of Venus and his uncle. The vulgar opinion, that it conveyed to heaven the divine soul of the dictator, was cherished and consecrated by the piety of a statesman; while his secret superstition referred the comet to the glory of his own times. The fifth visit has been already ascribed to the fifth year of Justinian, which coincides with the five hundred and thirty-first of the Christian æra. And it may deserve notice, that in this, as in the preceding instance, the comet was followed, though at a longer interval, by a remarkable paleness of the sun. The sixth return, in the year eleven hundred and six, is recorded by the chronicles of Europe and China: and in the first fervor of the crusades, the Christians and the Mahometans might surmise, with equal reason, that it portended the destruction of the Infidels. The seventh phenomenon, of one thousand six hundred and eighty, was presented to the eyes of an enlightened age. The philosophy of Bayle dispelled a prejudice which Milton's muse had so recently adorned, that the comet, "from its horrid hair shakes pestilence and war." Its road in the heavens was observed with exquisite skill by Flamstead and Cassini: and the mathematical science of Bernoulli, Newton *, and Halley, investigated the laws of its revolutions. At the eighth period, in the year two thousand three hundred and fifty-five, their calculations may perhaps be verified by the astronomers of some future capital in the Siberian or American wilderness.

II. The near approach of a comet may injure or destroy the globe which we inhabit; but the changes on its surface have been hitherto produced by the action of volcanoes and earthquakes. The nature of the soil may indicate the countries most exposed to these formidable concussions, since they are caused by subterraneous fires, and such fires are kindled by the union and fermentation of iron and sulphur. But their times and effects appear to lie beyond the reach of human curiosity; and the philosopher will discreetly abstain from the prediction of earthquakes, till he has counted the drops of water that silently filtrate on the inflammable mineral, and measured the caverns which increase by resistance the explosion of the imprisoned air. Without assigning the cause, history will distinguish the periods in which these calamitous events have been rare or frequent, and will observe, that this fever of the earth raged with uncommon violence during the reign of Justinian. Each year is marked by the repetition of earthquakes, of such duration, that Constantinople has been shaken above forty days; of such extent, that the shock has been communicated to the whole surface of the globe, or at least of the Roman empire. An impulsive or vibratory motion was felt: enormous chasms were opened, huge and heavy bodies were discharged into the air, the sea alternately advanced and retreated beyond its ordinary bounds, and a mountain was torn from Libanus, and cast into the waves, where it protected, as a mole, the new harbor of Botrys in Phnicia. The stroke that agitates an ant-hill may crush the insect-myriads in the dust; yet truth must extort confession that man has industriously labored for his own destruction. The institution of great