This vital force behind the nervous system contains stores of energy that can be called on for therapeutic purposes. It is the directing, co-ordinating and energizing force which controls the central nervous system, and enables it to accomplish its purposes. It is the disappearance of this force at death which leaves the body without vital activity, though no physical difference between the dead and the living body can be demonstrated. Changes in the body _follow_ death; they are not simultaneous. This vital force supplies the energy that we call the will, and underlies the process called "living on the will" which so often serves to maintain existence when there is every reason to think that a fatal termination is due. The amount of energy thus available is limited, {134} but is much more powerful than has been thought. It is of the greatest possible service in preserving health and eliminating disease. Its existence, demonstrated by the complex nervous system which we employ with such confidence, though we know nothing of it, furnishes the best possible basis for confident attempts at rousing the patient to use the vital energy he possesses for the strengthening of weakness, the correction of deficiency and the control of evil tendencies. CHAPTER VI UNCONSCIOUS CEREBRATION Many of the exhausting neurotic and psycho-neurotic affections so common in recent years are largely due to the failure of patients to secure such mental relaxation as will permit complete repair of nervous waste. We are proud of being a generation of specialists. Some men never get completely away from the set of thoughts with which they are occupied in their particular specialty. Waking or sleeping these thoughts are with them. It is almost impossible, then, for cells of the central nervous system to secure such rest as they need. Cells must be put at absolute rest so that nutritional processes may go on entirely undisturbed, and every portion of the cell be renewed in vigor. Re-creation, in its original meaning, is exactly what must be provided for nerve cells.