[Footnote: L'Enchanteur pourrissant, par Guillaume Apollinaire, avec illustrations gravees sur bois par Andre Derain. Paris, Kahnweiler, 1910.] Here is work which keeps the merest semblance of conventional form, which gives its effect by startling masses of black and white, by sudden curves, but more frequently by sudden angles. [Footnote: The renaissance of the angle in art is an interesting feature of the new movement. Not since Egyptian times has it been used with such noble effect. There is a painting of Gauguin's at Hagen, of a row of Tahitian women seated on a bench, that consists entirely of a telling design in Egyptian angles. Cubism is the result of this discovery of the angle, blended with the influence of Cezanne.] In the process of the gradual abandonment of natural form the "angle" school is paralleled by the "curve" school, which also descends wholly from Gauguin. The best known representative is Maurice Denis. But he has become a slave to sentimentality, and has been left behind. Matisse is the most prominent French artist who has followed Gauguin with curves. In Germany a group of young men, who form the Neue Kunstlevereinigung in Munich, work almost entirely in sweeping curves, and have reduced natural objects purely to flowing, decorative units. But while they have followed Gauguin's lead in abandoning representation both of these two groups of advance are lacking in spiritual meaning. Their aim becomes more and more decorative, with an undercurrent of suggestion of simplified form. Anyone who has studied Gauguin will be aware of the intense spiritual value of his work. The man is a preacher and a psychologist, universal by his very unorthodoxy, fundamental because he goes deeper than civilization. In his disciples this great element is wanting. Kandinsky has supplied the need. He is not only on the track of an art more purely spiritual than was conceived even by Gauguin, but he has achieved the final abandonment of all representative intention. In this way he combines in himself the spiritual and technical tendencies of one great branch of Post-Impressionism. The question most generally asked about Kandinsky's art is: "What is he trying to do?" It is to be hoped that this book will do something towards answering the question. But it will not do everything. This--partly because it is impossible to put into words the whole of Kandinsky's ideal, partly because in his anxiety to state his case, to court criticism, the author has been tempted to formulate more than is wise. His analysis of colours and their effects on the spectator is not the real basis of his art, because, if it were, one could, with the help of a scientific manual, describe one's emotions before his pictures with perfect accuracy. And this is impossible.