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sensations. In each sense the whole complex nervous mechanism, including the external organ, the connecting nerves and the brain, lies between the mind and the object. as the telescope between the eye and the stars, the whispering-gallery or the telephone between the ear and the speaker. Yet it is not of one or all of these conditions that the mind is cognizant. It sees through them, hears through them, feels, tastes, and smells through them. It carries the facts of vision outward to their remote objects, and the qualities of touch or flavor to their sources. The mind is always taking up and using instrumentally its organs, and is no more subject to mere effects in them, than is the eye in using a microscope cognizant of its images and lenses. Intermediate conditions lie as submerged links in the mind's activity.

No image could well be more inapt than. that of Locke in which he compared the mind to white paper. As all knowledge in chemistry up to the present time has been accumulating the conditions by which the plate of the photographer is made sensitive to light, so all evolution has joined in shaping that latest power by which mind feels. Mind is the one only agency which can so respond to the physical world. When we add perception to sensation, the marvel grows. All senses end in molecular changes. From these common terms, so like one to another, mind constructs, in the hidden joy of vision, and of every accessory sense, this universe about us, with its immeasurable spaces, its brilliant colors, its throbbing sounds, its sweet odors, its stimulating flavors, its velvety surfaces, and its thousand suggestions of life. If there is any fit image of omnipotence, it is this mind in the midst of the world which it momentarily evokes.

The third fact is the nature of the interaction between the last physical facts and the first mental ones. Men have