Monumental records, alike the slightest and the most solid, are subjected to the destructive operation of time, or to the being removed at the caprice or convenience of successive generations. The pyramids of Egypt remain, but the names of him who founded them, and of him whose memory they seemed destined to perpetuate, have perished together. Buildings for the use or habitation of man do not last for ever. Mighty cities, as well as detached edifices, are destined to disappear. Thebes, and Troy, and Persepolis, and Palmyra have vanished from the face of the earth. "Thorns and brambles have grown up in their palaces: they are habitations for serpents, and a court for the owl." There are productions of man however that seem more durable than any of the edifices he has raised. Such are, in the first place, modes of government. The constitution of Sparta lasted for seven hundred years. That of Rome for about the same period. Institutions, once deeply rooted in the habits of a people, will operate in their effects through successive revolutions. Modes of faith will sometimes be still more permanent. Not to mention the systems of Moses and Christ, which we consider as delivered to us by divine inspiration, that of Mahomet has continued for twelve hundred years, and may last, for aught that appears, twelve hundred more. The practices of the empire of China are celebrated all over the earth for their immutability. This brings us naturally to reflect upon the durability of the sciences. According to Bailly, the observation of the heavens, and a calculation of the revolutions of the heavenly bodies, in other words, astronomy, subsisted in maturity in China and the East, for at least three thousand years before the birth of Christ: and, such as it was then, it bids fair to last as long as civilisation shall continue. The additions it has acquired of late years may fall away and perish, but the substance shall remain. The circulation of the blood in man and other animals, is a discovery that shall never be antiquated. And the same may be averred of the fundamental elements of geometry and of some other sciences. Knowledge, in its most considerable branches shall endure, as long as books shall exist to hand it down to successive generations. It is just therefore, that we should regard with admiration and awe the nature of man, by whom these mighty things have been accomplished, at the same time that the perishable quality of its individual monuments, and the temporary character and inconstancy of that fame which in many instances has filled the whole earth with its renown, may reasonably quell the fumes of an inordinate vanity, and keep alive in us the sentiment of a wholsome diffidence and humility. ESSAY V. OF THE REBELLIOUSNESS OF MAN. There is a particular characteristic in the nature of the human mind, which is somewhat difficult to be explained. Man is a being of a rational and an irrational nature.