sense-perceptions, whereas the musical drama is supposed to awaken a higher cerebral activity, to produce presentations and thoughts, together with direct emotions; in which case each of the arts acting in concert will produce, in consequence of the necessary dispersion of the attention to it, a more feeble effect than if it appealed by itself alone to sense and intellect. Wagner’s second assertion, that the natural evolution of each art necessarily leads it to the surrender of its independence and to its fusion with the other arts,[189] contradicts so strongly all experience and all the laws of evolution, that it can at once be characterized as delirious. Natural development always proceeds from the simple to the complex--not inversely; progress consists in differentiation, _i.e._, in the evolution of originally similar parts into special organs of different structure and independent functions, and not in the retrogression of differentiated beings of rich specialization to a protoplasm without physiognomy. The arts have not arisen accidentally; their differentiation is the consequence of organic necessity; once they have attained independence, they will never surrender it. They can degenerate, they can even die out, but they can never again shrink back into the germ from which they have sprung. The effort to return to beginnings is, however, a peculiarity of degeneration, and founded in its deepest essence. The degenerate subject is himself on the downward road from the height of organic development which our species has reached; his imperfect brain is incapable of the highest and most refined operations of thought; he has therefore a strong desire to lighten them, to simplify the multifariousness of phenomena and make them easier to survey; to drag everything animate and inanimate down to lower and older stages of existence, in order to make them more easy of access to his comprehension. We have seen that the French Symbolists, with their colour-hearing, wished to degrade man to the indifferentiated sense-perceptions of the pholas or oyster. Wagner’s fusion of the arts is a pendant to this notion. His _Art-work of the Future_ is the art-work of times long past. What he takes for evolution is retrogression, and a return to a primeval human, nay, to a pre-human stage.