Without professing to adopt fully this view of my learned and venerable friend, I cannot but remark, that it explains one or two difficulties on this subject, which I shall more fully explain farther on. One is, the difficulty of conceiving how the inferior animals could have been distributed to their present places of residence from a single centre of creation without a miracle. Certain it is, that, as the climate and position of land and water now are, they could not thus migrate without certain destruction to many of them. But by this theory they might have been created within the districts which they now occupy. Another difficulty solved by this theory is, that several hundred species of animals, that were created long before man, as their remains found in the tertiary strata show, still survive, and there is no evidence that they ever became extinct; nor need they have been destroyed and recreated, if Dr. Smith's theory be true. Nevertheless, it does not appear to me essential to a satisfactory reconciliation of geology and revelation, that we should adopt it. But coming from such high authority, and sustained as it is by powerful arguments, it commends itself to our candid examination. Secondly. I remark, that it is not necessary that we should be perfectly sure that the method which has been described, or any other, of bringing geology into harmony with the Bible, is infallibly true. It is only necessary that it should be sustained by probable evidence; that it should fairly meet the geological difficulty on the one hand, and do no violence to the language or spirit of the Bible on the other. This is sufficient, surely, to satisfy every philosophical mind, that there is no collision between geology and revelation. But should it appear hereafter, either from the discoveries of the geologist or the philologist, that our views must be somewhat modified, it would not show that the previous views had been insufficient to harmonize the two subjects; but only that here, as in every other department of human knowledge, perfection is not attained, except by long-continued efforts. I make these remarks, because it is well known that other modes, besides that which I have defended, have been proposed to accomplish the same object; and it is probable that, even to this day, one or two of these modes may be defended, although the general opinion of geologists is in favor of that which I have exhibited.