3. _The mind or spirit._ This is immeasurably the highest and most important constituent of man. His body material may fall back to dust. His body electrical may be reabsorbed in the great ocean of natural electricity that fills the earth and the heavens. But his mind is immortal. His spirit, made in the divine image, lives and acts, thinks and feels, independently of every other existence save Him from whom its being came. While in connection with its visible body, its good or ill, its bliss or woe, has, indeed, much to do with its bodily state. But, when separated from this body, its high and more independent existence is at once asserted; and then its good or ill are determined by its Author only in accordance with the workings and affections within itself. A spiritual and indestructible being like its Creator, it can never cease to be while he exists. But our present concern is with the mind in its relation to that electro-vital medium between it and the body, and to the body itself. The mind's influence upon both of these lower parts of the entire man is truly wonderful, although perceptible mostly on the material body. Few persons are aware how much the state of the mind affects the bodily health, although the degree is often very great. Yet this is done by the mind's action, first on the electro-vital functions, and through these, by way of the nerves, upon the bodily tissue. Changes in the mental states will, in this way, frequently produce changed polarization in the physical organs, and thus determine infallibly the matter of health or disease. So, too, the condition of the bodily health will often determine irresistibly the mental state. Whatever bodily changes affect the polarization of the electro-vital medium in any part of the organism, do thereby produce corresponding changes in the mind. These views of the reciprocal action between mind and body, through the medium of the electro-vital element, may serve to explain those psychological wonders exhibited in the cure of diseases by the imagination, as well as in diseases and even death induced by the imagination. I would much like to unfold and illustrate this bearing of the subject; and, also, in the light of it, to show the _philosophy_ of one mind acting intelligibly on another mind, with, and even _without_, the aid of the physical organs, as is sometimes seen in the facts of mesmerism. This I have done in my written lectures, for the instruction of classes; but my limits will not admit of it here.