The most plausible theory of beauty is that which makes it consist in two contrary and equally necessary elements—unity and variety. A beautiful flower has all the elements we have named; it has unity, symmetry, and variety of shades of color. There is no beauty without life, and life is movement, diversity. These elements are found in beautiful and also in sublime objects. A beautiful object is complete, finished, limited with symmetrical parts. A sublime object whose forms, though not out of proportion, are less determined, ever awakens in us the feeling of the infinite. In objects of sense all qualities that can produce the feeling of the beautiful come under one class called physical beauty. But above and beyond this in the region of mind we have first intellectual beauty, including the laws that govern intelligence and the creative genius of the artist, the poet, and the philosopher. Again, the moral world has beauty in its ideas of liberty, of virtue, of devotion, the justice of Aristides, the heroism of Leonidas. We have now ascertained that there is beauty and sublimity in nature, in ideas, in feelings, and in actions. After all this it might be supposed that a unity could be found amidst these different kinds of beauty. The sight of a statue, as the Apollo of Belvedere, of a man, of Socrates expiring, are adduced as producing impressions of the beautiful; but the form cannot be a form by itself, it must be the form of something. Physical beauty is the sign of an interior beauty, a spiritual and moral beauty which is the basis, the principle, and the unity of the beautiful. Physical beauty is an envelop to intellectual and to moral beauty. Intellectual beauty, the splendor of the true, can only have for principle that of all truth. Moral beauty comprehends two distinct elements, equally beautiful, justice and charity. Thus God is the principle of the three orders of beauty, physical, intellectual, and moral. He also construes the two great powers distributed over the three orders, the beautiful and the sublime. God is beauty par excellence; He is therefore perfectly beautiful; He is equally sublime. He is to us the type and sense of the two great forms of beauty. In short, the Absolute Being as absolute unity and absolute variety is necessarily the ultimate principle, the extreme basis, the finished ideal of all beauty. This was the marvellous beauty which Diotimus had seen, and which is described in the Banquet of Socrates. It is our purpose after the previous discussion to attempt to elucidate still further the idea of art by following its historic development.