I may appear to dwell too long upon this topic; but my excuse must be that it leads to a true estimate both of natural history and of the sacred Scriptures. The study of nature guides to those large views of the unity and order of creation which alone are worthy of a being of the rank of man, and which lead him to adequate conceptions of the Creator; but the truly wise recognize three grades of beauty. First, that of art, which, in its higher efforts, can raise ordinary minds far above themselves. Secondly, that of nature, which, in its most common objects, must transcend the former, since its artist is that God of whose infinite mind the genius of the artist is only a faint reflection. Thirdly, that pre-eminent beauty of moral goodness revealed only in the spiritual nature of the Supreme. The first is one of the natural resources of fallen man in his search for happiness. The second was man's joy in his primeval innocence. The third is the inheritance of man redeemed. It is folly to place these on the same level. It is greater folly to worship either or both of the first without regard to the last. It is true wisdom to aspire to the last, and to regard nature as the handmaid of piety, art as but the handmaid of nature. Nature to the unobservant is merely a mass of things more or less beautiful or interesting, but without any definite order or significance. An observer soon arrives at the conclusion that it is a series of circling changes, ever returning to the same points, ever renewing their courses, under the action of invariable laws. But if he rests here, he falls infinitely short of the idea of the Cosmos, and stands on the brink of the profound error of eternal succession. A little further progress conducts him to the inviting field of special adaptation and mutual relation of things. He finds that nothing is without its use; that every structure is most nicely adjusted to special ends; that the supposed ceaseless circling of nature is merely the continuous action of great powers, by which an infinity of utilities are worked out--the great fly-wheel which, in its unceasing and at first sight apparently aimless round, is giving motion to thousands of reels and spindles and shuttles, that are spinning and weaving, in all its varied patterns, the great web of life.