Henry Wood says of the Subconscious Mind: "It acts automatically upon the physical organism. It cognizes external facts, conditions, limitations, and even contagions, quite independent of its active counterpart. One may, therefore, 'take' a disease and be unaware of any exposure. The subconsciousness has been unwittingly trained to fear, and accept it; and it is this quality, rather than the mere inert matter of the body, that succumbs. Matter is never the actor, but is always acted upon. This silent, mental partner, in operation, seems to be a living, thinking personality, conducting affairs on its own account. It is a compound of almost unimaginable variety, including wisdom and foolishness, logic and nonsense, and yet having a working unitary economy. It is a hidden force to be dealt with and educated, for it is often found insubordinate and unruly. It refuses co-operation with its lesser but more active and wiser counterpart. It is very 'set' in its views, and only changes its qualities and opinions by slow degrees. But, like a pair of horses, not until these two mental factors can be trained together can there be harmony and efficiency." In order to understand the important part played in the physical economy by the Subconscious Mind, it is only necessary to understand the various processes of the human system which are out of the ordinary field of the voluntary or conscious mind. We then realize that the entire process of nutrition, including digestion, assimilation, etc., the processes of elimination, the processes of circulation, the processes of growth, in fact the entire processes manifested in the work of the cells, cell-groups, ganglia, physical organs, etc., are in charge of and controlled by the Subconscious Mind. Our food is digested and transformed into the nourishing substances of the blood; then carried through the arteries to all parts of the body, where it is absorbed by the cells and used to replace the worn-out material, the latter then being carried back through the veins to the lungs where the waste matter is burned up, and the balance again sent on its journey through the arteries re-charged with the life-giving oxygen. All of these processes, and many others of almost equal importance, are out of the field of the conscious or voluntary mind, and are governed by the Subconscious Mind. As we shall see when we consider the Sympathetic Nervous System, the greater part of the body is dominated by the Subconscious Mind, and that the welfare of the major physical functions depends entirely, or almost so, upon this great area or field of the mind.