The particular emotion produced in us by such things as are beautiful, works of art or of nature, recollections and thoughts as well as sights and sounds, the emotion of aesthetic pleasure, has been recognised ever since the beginning of time as of a mysteriously ennobling quality. All philosophers have told us that; and the religious instinct of all mankind has practically proclaimed it, by employing for the worship of the highest powers, nay, by employing for the mere designation of the godhead, beautiful sights, and sounds, and words by which beautiful sights and sounds are suggested. Nay, there has always lurked in men's minds, and expressed itself in the metaphors of men's speech, an intuition that the Beautiful is in some manner one of the primordial and, so to speak, cosmic powers of the world. The theories of various schools of mental science, and the practice of various schools of art, the practice particularly of the persons styled by themselves aesthetes and by others decadents, have indeed attempted to reduce man's relations with the great world-power Beauty to mere intellectual dilettantism or sensual superfineness. But the general intuition has not been shaken, the intuition which recognised in Beauty a superhuman, and, in that sense, a truly divine power. And now it must become evident that the methods of modern psychology, of the great new science of body and soul, are beginning to explain the reasonableness of this intuition, or, at all events, to show very plainly in what direction we must look for the explanation of it. This much can already be asserted, and can be indicated even to those least versed in recent psychological study, to wit, that the power of Beauty, the essential power therefore of art, is due to the relations of certain visible and audible forms with the chief mental and vital functions of all human beings; relations established throughout the whole process of human and, perhaps, even of animal, evolution; relations seated in the depths of our activities, but radiating upwards even like our vague, organic sense of comfort and discomfort; and permeating, even like our obscure relations with atmospheric conditions, into our highest and clearest consciousness, colouring and altering the whole groundwork of our thoughts and feelings.