To take one prominent instance:—So far as we can judge, the human body is the most perfect of Nature’s works; in it the groundwork of skeleton is never seen, and though it can hardly be said to be anywhere concealed, it is only displayed at the joints or more prominent points of support, where the action of the frame would be otherwise unintelligible. The muscles are disposed not only where they are most useful, but so as to form groups gracefully rounded in outline. The softness and elegance of these are further aided by the deposition of adipose matter, and the whole is covered with a skin which with its beautiful texture conceals the more utilitarian construction of the internal parts. In the trunk of the body the viscera are disposed wholly without symmetry or reference to beauty of any sort—the heart on one side, the liver on the other, and the other parts exactly in those positions and in those forms by which they may most directly and easily perform the essential functions for which they are designed. But the whole is concealed in a perfectly symmetrical sheath of the most exquisitely beautiful outline. It may be safely asserted that a building is beautiful and perfect exactly in the ratio in which the same amount of concealment and the same amount of display of construction is preserved, where the same symmetry is shown as between the right and left sides of the human body—the same difference as between the legs and arms, where the parts are applied to different purposes, and where the same amount of ornament is added, to adorn without interfering with what is useful. In short, there is no principle involved in the structure of man which may not be taken as the most absolute standard of excellence in architecture. It is in Nature’s highest works that we find the symmetry of proportion most prominent. When we descend to the lower types of animals we lose it to a great extent, and among trees and vegetables generally find it only in a far less degree, and sometimes miss it altogether. In the mineral kingdom among rocks and stones it is altogether absent. So universal is this principle in Nature that we may safely apply it to our criticism on art, and say that a building is perfect as a whole in proportion to its motived regularity, and departs from the highest type in the ratio in which symmetrical arrangement is neglected. It may, however, be incorrect to say that an oak-tree is a less perfect work of creation than a human being, but it is certain that it is lower in the scale of created beings. So it may be said that a picturesque group of Gothic buildings may be as perfect as the stately regularity of an Egyptian or classic temple; but if it is so, it is equally certain that it belongs to a lower and inferior class of design.