It thus appears that Scripture and geology so far concur respecting the events of this period as to establish, even without any other evidence, a probability that the fifth day corresponds with the geological ages with which I have endeavored to identify it. Geology, however, gives us no means of measuring precisely the length of this day; but it gives us the impression that it occupied an enormous length of time, compared with which the whole human period is quite insignificant; and rivalling those mythical "days of the Creator" which we have noticed as forming a part of the Hindoo mythology. Why was the earth thus occupied for countless ages by an animal population whose highest members were reptiles and birds? The fact can not be doubted, since geology and Scripture, the research of man and the Word of God, concur in affirming it. We know that the lowest of these creatures was, in its own place, no less worthy of the Creator than those which we regard as the highest in the scale of organization, and that the animals of the ancient, equally with those of the modern world, abounded in proofs of the wisdom, power, and goodness of their Maker. Comparative anatomy has shown that these extinct animals, though often varying much from their modern representatives, are in no respect rude or imperfect; that they have the same appearance of careful planning and elaborate execution, the same combination of ornament and utility, the same nice adaptation to the conditions of their existence, which we observe in modern creatures. In addition to this, the many new and wonderful contrivances and combinations which they present, and their relations to existing objects, have greatly enlarged our views of the variety and harmony of the whole system of nature. They are, therefore, in these respects, not without their use as manifestations of the Creator, in this our later age.