This aerial bow, as it hangs between the busy cities, “curving on a sky imbrued with color,” is perfect as an organism of nature. It is an organism of nature. There was no question in the mind of its designer of “good taste” or of appearance. He learned the law that struck its curves, the law that fixed the strength and the relation of its parts, and he applied the law. His work is beautiful, as the work of a ship-builder is unfailingly beautiful in the forms and outlines in which he is only studying “what the water likes,” without a thought of beauty, and as it is almost unfailingly ugly when he does what he likes for the sake of beauty. The designer of the Brooklyn Bridge has made a beautiful structure out of an exquisite refinement of utility, in a work in which the lines of forces constitute the structure. Where a more massive material forbade him to skeletonize the structure, and the lines of effort and resistance needed to be brought out by modelling, he has failed to bring them out, and his structure is only as impressive as it needs must be. It has not helped his work, as we have seen, to trust his own sense of beauty, and to contradict or to conceal what he was doing in accordance with its dictates. As little would it have helped him to invoke the aid of a commonplace architect to plaster his structure with triglyphs or to indent it with trefoils. But an architect who pursued his calling in the spirit and with the skill of the mediæval builders of whom we have been speaking, who knew in his province the lesson the engineer has re-enforced in his, that “Nature can only be commanded by obeying her,” and that the function of an organism, in art as in nature, must determine its form--such an architect might have helped the designer of the Brooklyn Bridge to make it one of the noblest monuments of architecture in the world, as it is one of the greatest and most honorable works of engineering. [Illustration]_AN AMERICAN CATHEDRAL_ I