Now, it seems quite certain, that these beaches and terraces were formed as the continents were being drained of the waters of the ocean, and the rivers were cutting down their beds; which last process has been going on in many places to the present day. Yet scarcely nowhere, since the memory of man, have even the lowest of these terraces and beaches been formed, save on a very limited scale, and of a few feet in height. The lowest of them have been the sites of towns and cities, ever since the settlement of our country, and on the eastern continent much longer. Yet we see the processes by which they have been formed now in operation; but they have scarcely made any progress during the period of human history. How vast the period, then, since the work was first commenced! Yet even its commencement seems to have been no farther back than the drift epoch, since that deposit lies beneath the terraces. But the drift period was comparatively a very recent one on the geological scale. How do such facts impress us with the vast duration of the globe since the first series of changes commenced! Finally. There is no little reason to believe that, previous to the formation of the stratified rocks, the earth passed through changes that required vast periods of time, by which it was gradually brought into a habitable state. It is even believed that one of its earliest conditions was that of vapor; that, gradually condensing, it became a melted globe of fire, and then, as it gradually cooled, a crust formed over its surface; and so at last it became habitable. All this is indeed hypothesis; and, therefore, I do not place it in the same rank as the other proofs of the earth's antiquity, already adduced. Still this hypothesis has so much evidence in its favor, that not a few of the ablest and most cautious philosophers of the present day have adopted it. And if it be indeed true, it throws back the creation of the universe to a period remote beyond calculation or conception. Now, let this imperfect summary of evidence in favor of the earth's high antiquity be candidly weighed, and can any one think it strange that every man, who has carefully and extensively examined the rocks in their native beds, is entirely convinced of its validity? Men of all professions, and of diverse opinions concerning the Bible, have been geologists; but on this point they are unanimous, however they may differ as to other points in the science. Must we not, then, regard this fact as one of the settled principles of science? If so, who will hesitate to say that it ought to settle the interpretation of the first verse of Genesis, in favor of that meaning which allows an intervening period between the creation of matter and the creation of light? This is the grand point which I have aimed to establish; and, in conclusion, I beg leave to make a few remarks by way of inference.