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view of activity and yet be on both sides of the "line" which is said to exist between them. What we mean by our descriptions of nature is that certain activities or vibrations are translated into what we call "consciousness." I do not see yonder patch of greens and browns, for example, as a motionless, dead thing. Certain wave motions are brought to my eyes, where they are translated into what we call "colour." I do not hear your voice as a thing by itself. My ears receive the vibrations, and my mind perceives the psychological result. Examine each of your experiences in the world of nature and you will find that they are made known to you through the mental correspondence to what is called "vibration.'' We are compelled to distinguish between mind and matter because there is a vast difference between (1) activities which, like the perception of fire, are involuntarily brought in upon us, and (2) those activities which, like an emotion, respond to the will. Your whole physical life is a mass of vibrations brought in upon you, reporting themselves in consciousness. When something interferes with the normal vibration, you are made painfully aware of the fact, and you naturally ask how you shall adjust yourself to the change. The whole practical question is, Is it possible not merely to "hold thoughts," but actually to bring about changes in the disturbed