It is well known, that in the written and unwritten traditions of almost every nation and tribe under heaven, the story of a general deluge has been prominent; and probably, in all these cases, some attempt has been made to explain the manner in which the waters were brought over the land. But most of these reasonings, especially in ancient times, are too absurd to deserve even to be recited. Indeed, it is not till the beginning of the sixteenth century, that we find any discussions on the subject worthy of notice. At that time, some excavations at Verona, in Italy, brought to light many fossil shells, and awakened a question as to their origin. Some maintained that they were only _simulacra_, or resemblances to animals, but never had a real existence. They were supposed to have been produced by a certain "_materia pinguis_," or "fatty matter," existing in the earth. Others maintained that they were deposited by the deluge of Noah. Such, indeed, was the general opinion; but Fracastoro and a few others maintained that they were once real animals, and could not have been brought into their present condition by the last deluge. For more than three hundred years have these questions been more or less discussed; and though decided many years ago by all geologists, not a few intelligent men still maintain, that petrified shells are mere abortive resemblances of real beings, or that they were deposited by the deluge. The advocates of the diluvial origin of petrifactions soon found themselves hard pressed with the question, how these relics could be scattered through strata many thousand feet thick, by one transient flood. They, therefore, came to the conclusion, in the words of Woodward, a distinguished cosmogonist of the eighteenth century, that the "whole terrestrial globe was taken to pieces and dissolved at the flood, and the strata settled down from this promiscuous mass, as any earthy sediment from a fluid." During that century, many works appeared upon cosmogony, defending similar views, by such men as Burnet, Scheuchzer, and Catcott. Some of these works exhibited no little ability, mixed, however, with hypotheses so extravagant that they have ever since been the butt of ridicule. The very title of Burnet's work cannot but provoke a smile. It is called "The Sacred Theory of the Earth, containing an Account of the Original of the Earth, and of all the general Changes it bath already undergone, or is to undergo, till the Consummation of all Things." He maintained that the primitive earth was only "an orbicular crust, smooth, regular, and uniform, without mountains and without a sea." This crust rested on the surface of a watery abyss, and, being heated by the sun, became chinky; and in consequence of the rarefaction of the included vapors, it burst asunder, and fell down into the waters, and so was comminuted and dissolved, while the inhabitants perished. Catcott's work was confined exclusively to the deluge, and exhibited a good deal of