We have heard it sometimes objected that plants and animals could not have existed without light; and that light was not created until the beginning of the First Mosaic Day. Many curious and interesting facts are adduced in support of this argument. For example, we are reminded that certain Fossil animals belonging to the earliest Geological Periods, are shown by the clearest evidence, to have had eyes constructed on the same optical principles, and accommodated to the same optical conditions, as the eyes of those animals that have flourished on the Earth during the period of history: and such eyes, it is contended, plainly import the existence of light. The answer to this objection may be stated in a very few words. We freely admit that the hypothesis we have been defending would be of little use to account for Geological phenomena, if it did not include the existence of light, during that Period of indefinite duration which we suppose to have elapsed between the first creation of the world and the work of the Six Days. But in truth there is no difficulty in supposing that, during such an interval, light may have prevailed upon the earth, and air, and all the other conditions of organic life, pretty much as they do at the present day. Afterward, at the close of the period, when, perhaps, ages innumerable had rolled by, this planet of ours would have appeared in that condition which is described in the second verse of Genesis: “And the earth was waste and empty, and darkness was upon the face of the deep.” Then the command of God would have gone forth, “Let there be light:” and at once the darkness would have been dispelled, a new era of existence would have commenced, and the Earth would forthwith have been set in order and furnished, in a special manner, for the habitation of man.