Perhaps the fault of this book of theory--or rather the characteristic most likely to give cause for attack--is the tendency to verbosity. Philosophy, especially in the hands of a writer of German, presents inexhaustible opportunities for vague and grandiloquent language. Partly for this reason, partly from incompetence, I have not primarily attempted to deal with the philosophical basis of Kandinsky's art. Some, probably, will find in this aspect of the book its chief interest, but better service will be done to the author's ideas by leaving them to the reader's judgement than by even the most expert criticism. The power of a book to excite argument is often the best proof of its value, and my own experience has always been that those new ideas are at once most challenging and most stimulating which come direct from their author, with no intermediate discussion. The task undertaken in this Introduction is a humbler but perhaps a more necessary one. England, throughout her history, has shown scant respect for sudden spasms of theory. Whether in politics, religion, or art, she demands an historical foundation for every belief, and when such a foundation is not forthcoming she may smile indulgently, but serious interest is immediately withdrawn. I am keenly anxious that Kandinsky's art should not suffer this fate. My personal belief in his sincerity and the future of his ideas will go for very little, but if it can be shown that he is a reasonable development of what we regard as serious art, that he is no adventurer striving for a momentary notoriety by the strangeness of his beliefs, then there is a chance that some people at least will give his art fair consideration, and that, of these people, a few will come to love it as, in my opinion, it deserves. Post-Impressionism, that vague and much-abused term, is now almost a household word. That the name of the movement is better known than the names of its chief leaders is a sad misfortune, largely caused by the over-rapidity of its introduction into England. Within the space of two short years a mass of artists from Manet to the most recent of Cubists were thrust on a public, who had hardly realized Impressionism. The inevitable result has been complete mental chaos. The tradition of which true Post-Impressionism is the modern expression has been kept alive down the ages of European art by scattered and, until lately, neglected painters. But not since the time of the so-called Byzantines, not since the period of which Giotto and his School were the final splendid blossoming, has the "Symbolist" ideal in art held general sway over the "Naturalist." The Primitive Italians, like their predecessors the Primitive Greeks, and, in turn, their predecessors the Egyptians, sought to express the inner feeling rather than the outer reality.