tween materialism and spiritualism, should be stated, then, it seems to us, in the following terms: How is it that the same images can belong at the same time to two different systems, the one in which each image varies for itself and in the well-defined measure that it is patient of the real action of surrounding images, the other in which all change for a single image, and in the varying measure that they reflect the eventual action of this privileged image?
Every image is within certain images and without others; but of the aggregate of images we cannot say that it is within us or without us, since interiority and exteriority are only relations among images. To ask whether the universe exists only in our thought, or outside of our thought, is to put the problem in terms that are insoluble, even if we suppose them to be intelligible; it is to condemn ourselves to a barren discussion, in which the terms thought, being, universe, will always be taken on either hand in entirely different senses. To settle the matter, we must first find a common ground on which combatants may meet; and since on both sides it is agreed that we can only grasp things in the form of images, we must state the problem in terms of images, and of images alone. Now no philosophical doctrine denies that the same images can enter at the same time into two distinct systems, one belonging to science, wherein each image, related only to itself, possesses an
