This view of the Physiology and Psychology of the very familiar but very marvellous condition of Sleep and Dream seems to conduct the inquirer to some conclusions, whose importance and interest it would be impossible to exaggerate; for, if there be any truth in them, they point directly to revelations of the hidden structure of the Mechanism of Man, which have been taught as a dogma and accepted as a faith, but for the proof of which by science as a fact in nature evidence has hitherto been wanting. The condition of Sleep indicates a _dual_ structure—that mind and body are not one, as the Materialists teach; for when the body sleeps the mind is awake, and often the mind is more active and more able when it is thus partially released from the burden of the body. In sleep the phenomena of dream exhibit this independence of the body yet more powerfully. The mind lives a life of its own, with its own measurements of time and space, so different from those to which it is limited by the material structure of the body. Self-consciousness is preserved in dream while the mind is inventing a whole drama of events and persons, so that we contemplate the work of the mind as if it was something existing without. This proves that the contemplating consciousness is something other than the thing contemplated. The “I” that views and remembers the action of the brain (which is the material organ of the mind) cannot be the brain itself, nor the mind itself, but must be something distinct from either, although intimately associated with both. That conscious and contemplating something is the _thing_—the entity—the “I”—the “You”—the being—the individual—which may be called “Soul” or “Spirit,” or by any other name, but which we intend to designate when we use those terms. These phenomena go far to prove that Man is a “living Soul” clothed with a material body—that this Soul is in fact the person—the individual—the being—of whom the molecular body is but the incrustation, the atoms agglomerated into molecules at the point of contact with the molecularly constructed world in which the present stage of its existence is to be passed.