The amount necessary to cover the earth to the tops of the highest mountains, or about five miles above the present oceans, would be eight times greater than that existing on the globe at this time. From whence could this immense volume of water have been derived? A great deal of ingenuity has been devoted to give an answer to this inquiry. By some it has been supposed, that most of the earth's interior is occupied by water, and the theorist had only to devise means for forcing it to the surface. One does this by the forcible compression of the crust; another, by the expansive power of internal heat; another, by the generation of various gases through galvanic action. Others have maintained that the antediluvian continents were sunk beneath the ocean at that time, though such find it hard to tell us why there was a rain of forty days upon land that was ready to subside beneath the ocean. Others have resort to a comet's impinging against the earth, and throwing the waters of the ocean over the land. But they were not aware that comets are mere vapor. Others suppose (and surely theirs is the most plausible theory) that the elevation of the bed of some ocean, by volcanic agency, threw its waters over the adjoining continents, and the mighty wave thus produced would not stop till it had swept over all other continents and islands. But in this case, it is evident that the continent first overflowed must have been left dry before the wave had reached other continents, so that, in fact, all parts of the earth would not have been enveloped simultaneously; and besides, how unlike such a violent rushing of the waters over the land is the scriptural account! In short, so unsatisfactory have been most of the theories to account for the water requisite to produce a universal deluge, that most writers have resorted, in the end, to miraculous agency to obtain it. And that, in fact, is the most satisfactory mode of getting over this difficulty, if the Scriptures unequivocally teach the universality of the deluge. A second objection to such a universality is, the difficulty of providing for the animals in the ark.