There are, then, two realms of mind, the conscious and the subconscious. Another way of expressing it would be to say that mind functions through two avenues--the avenue of the conscious and the avenue of the subconscious. The conscious is the thinking mind; the subconscious is the doing mind. The conscious is the sense mind, it comes in contact with and is acted upon through the avenue of the five senses. The subconscious is that quiet, finer, all-permeating inner mind or force that guides all the inner functions, the life functions of the body, and that watches over and keeps them going even when we are utterly unconscious in sleep. The conscious suggests and gives directions; the subconscious receives and carries into operation the suggestions that are received. The thoughts, ideas, and even beliefs and emotions of the conscious mind are the seeds that are taken in by the subconscious and that in this great _realm of causation_ will germinate and produce of their own kind. The chemical activities that go on in the process of cell formation in the body are all under the influence, the domination of this great all-permeating subconscious, or subjective realm within us. In that able work, "The Laws of Psychic Phenomena," Dr. Thomas J. Hudson lays down this proposition: "That the subjective mind is constantly amenable to control by suggestion." It is easy, when we once understand and appreciate this great fact, to see how the body builds, or rather is built, for health and strength, or for disease and weakness; for youth and vigour, or for premature ossification and age. It is easy, then, to see how we can have a hand in, in brief can have the controlling hand in, building either the one or the other. It is in the province of the intelligent man or woman to take hold of the wheel, so to speak, and to determine as an intelligent human being should, what condition or conditions shall be given birth and form to and be externalised in the body. A noted thinker and writer has said: "Whatever the mind is set upon, or whatever it keeps most in view, that it is bringing to it, and the continual thought or imagining must at last take form and shape in the world of seen and tangible things." And now, to be as concrete as possible, we have these facts: The body is continually changing in that it is continually throwing out and off, used cells, and continually building new cells to take their places. This process, as well as all the inner functions of the body, is governed and guarded by the subconscious realm of our being. The subconscious can do and does do whatever it is _actually_ directed to do by the conscious, thinking mind. "We must be careful on what we allow our minds to dwell," said Sir John Lubbock, "the soul is dyed by its thoughts."