Again, in order to reach the social, historical, and metaphysical background of life--the milieu, the method of thought is the only available one. For the milieu is not anything that can be seen or heard or touched; it does not manifest itself to perception, but has to be constructed by a process of inference and synthesis. Much of it, to be sure, can be divined from the acts and conversations, from the dress and manners of the characters, but there is always more that has to be directly expounded. The writer cannot rely upon the reader's perspicacity to make the right inferences, or upon his knowledge to supply sufficient data; nor can he make his characters tell all that he may want told about their past and the life of the world in which they live, and through the influence of which they have become what they are. The novelist must construct for the reader the _mise en scene_ of his story. Yet this must be held in complete subordination to the story. The intellectual background must lie behind, not athwart the story; it must be created for the sake of the story, not the story for its sake. A philosophy of life, even, is the inevitable presupposition of every story. For no writer, no matter how direct and empirical he may be in his methods, can escape from looking at life through the glass of certain political, social, and religious ideas. He may have none of his own construction, yet he will unconsciously share those of his age. The prose literature of our own age, aside from some minor differences of technique, differs from that of the past chiefly through its more democratic and naturalistic views of life. And just as we rightly ask of the novelist that he enlighten us regarding the subtler causation of human action, so with equal right we may ask him to exhibit the relations of the persons and incidents which he describes to social organization, spiritual movements, and nature; for only so can they be seen in their complete reality. Yet right here lurks a danger threatening the enduring beauty of every story thus made complete. For the social and cosmic background of life, as we have observed, can be constructed only through thought, and thought, particularly regarding such matters, is peculiarly liable to error. The artist who goes very deep into this is sure to make mistakes. Even when he tries to use the latest sociological, economic, and political theories, he runs great risks; for these theories are always one-sided and subject to correction; they never prove themselves to be what the artist thinks and wants them to be--concrete views which he can apply with utter faith. How many stories of the century past have been marred by the author's too ready application of Darwinism to social life! When we can separate the story from its intellectual background, the inadequacy of the latter matters little; for we can apply metaphysical and political criticism to the theory and enjoy the story aesthetically;