I have accomplished, to the best of my ability, this work which has occupied me for 15 years, on a subject near to me—that of art. By saying that this subject has occupied me for 15 years, I do not mean that I have been writing this book 15 years, but only that I began to write on art 15 years ago, thinking that when once I undertook the task I should be able to accomplish it without a break. It proved, however, that my views on the matter then were so far from clear that I could not arrange them in a way that satisfied me. From that time I have never ceased to think on the subject, and I have recommenced to write on it 6 or 7 times; but each time, after writing a considerable part of it, I have found myself unable to bring the work to a satisfactory conclusion, and have had to put it aside. Now I have finished it; and however badly I may have performed the task, my hope is that my fundamental thought as to the false direction the art of our society has taken and is following, as to the reasons of this, and as to the real destination of art, is correct, and that therefore my work will not be without avail. But that this should come to pass, and that art should really abandon its false path and take the new direction, it is necessary that another equally important human spiritual activity,—science,—in intimate dependence on which art always rests, should abandon the false path which it too, like art, is following. Science and art are as closely bound together as the lungs and the heart, so that if one organ is vitiated the other cannot act rightly. True science investigates and brings to human perception such truths and such knowledge as the people of a given time and society consider most important. Art transmits these truths from the region of perception to the region of emotion. Therefore, if the path chosen by science be false so also will be the path taken by art. Science and art are like a certain kind of barge with kedge-anchors which used to ply on our rivers. Science, like the boats which took the anchors up-stream and made them secure, gives direction to the forward movement; while art, like the windlass worked on the barge to draw it towards the anchor, causes the actual progression. And thus a false activity of science inevitably causes a correspondingly false activity of art. As art in general is the transmission of every kind of feeling, but in the limited sense of the word we only call that art which transmits feelings acknowledged by us to be important, so also science in general is the transmission of all possible knowledge; but in the limited sense of the word we call science that which transmits knowledge acknowledged by us to be important.