We should overrun our limits if we were to follow out the admirable discussion in which M. Taine extends this definition to architecture and music. These closely allied arts are distinguished from poetry, painting, and sculpture, by appealing far less directly to the intelligence, and far more exclusively to the emotions. Yet these arts likewise aim, by bringing into prominence certain relations of symmetry in form as perceived by the eye, or in aerial vibrations as perceived by the ear, to excite in us the states of feeling with which these species of symmetry are by subtle laws of association connected. They, too, imitate, not literally, but under the guidance of a predominating sentiment or emotion, relations which really exist among the phenomena of nature. And here, too, we estimate excellence, not in proportion to the direct, but to the indirect imitation. A Gothic cathedral is not, as has been supposed, directly imitated from the towering vegetation of Northern forests; but it may well be the expression of the dim sentiment of an unseen, all-pervading Power, generated by centuries of primeval life amid such forests. So the sounds which in a symphony of Beethoven are woven into a web of such amazing complexity may exist in different combinations in nature; but when a musician steps out of his way to imitate the crowing of cocks or the roar of the tempest, we regard his achievement merely as a graceful conceit. Art is, therefore, an imitation of nature; but it is an intellectual and not a mechanical imitation; and the performances of the camera and the music-box are not to be classed with those of the violinist's bow or the sculptor's chisel. And lastly, in distinguishing art from science, Taine remarks, that in disengaging from their complexity the causes which are at work in nature, and the fundamental laws according to which they work, science describes them in abstract formulas conveyed in technical language. But art reveals these operative causes and these dominant laws, not in arid definitions, inaccessible to most people, intelligible only to specially instructed men, but in a concrete symbol, addressing itself not only to the understanding, but still more to the sentiments of the ordinary man. Art has, therefore, this peculiarity, that it is at once elevated and popular, that it manifests that which is often most recondite, and that it manifests it to all.