The centre of attention is constantly changing; yet whenever a thinking creature stops to ask himself, who is doing this? Who is willing this? Who is thinking this? the answer is given: “I am doing this; I am willing this; I am thinking this.” The structure of the little pronoun “I” seems to be the most ticklish of all; it is always ready to force itself into the foreground. The answer, “I am doing this,” proposes the _totum pro parte_. The whole personality is supposed to do what a part of it is performing. The hands are executing this work; these hands of course are innervated from certain regions of the brain. Some parts of the personality are in a relative rest and have nothing to do with the work presently on hand. A commotion in a certain number of brain-structures represents the physiological aspect of a deliberation, perhaps the planning of some action. Psychologically considered certain ideas appear successively and sometimes simultaneously in the focus of consciousness. The ideas disagree and other ideas replace them until a combination is formed in which the ideas do agree. This state of agreement brings a temporary peace into the tumult of conflicting ideas; the plan is ready; it may pass into action at once, or, perhaps, the ego-structure will appear in consciousness and will quietly think: “I will do it.” When certain motory nerve-structures are innervated, they cause under normal conditions their respective muscles to contract, they produce motion. Under normal conditions the nervous process accompanying the idea “I will raise my arm” serves as an irritation upon the cortical centre of arm-raising, yet it is not the “I” that in some mystical way raises the arm. The idea “I” has as little and as much to do with this discharge of energy as any other idea. The idea “I” is not the power behind the veil that produces the will. What is will? As soon as some plan of action is joined with the idea that it should be executed, supposing it be not counteracted by any stronger idea that it should not be done, this combination represents a will. A will accordingly is the psychological aspect of an incipient action, and it is usually, or if it is not it can always be accompanied with the thought “I will it.” But this accompanying thought however is not the energy displayed in the act of willing. The “I will it,” or “I do it,” or “I perceive it” being always ready to appear together with the strongest idea in the field of consciousness, the term “ego” has acquired a specialised meaning. It means that part of a man’s personality which at the time is the contents of the “I will,” or “I think,” i. e. it is his present state of consciousness. Every organism is a coherent system and thus all the feelings of an organism naturally blend into a unity. The strongest feeling however appears in the normal state of waking in a distinct clearness thus representing a centre of consciousness.