_There is no royal method of training in concentration. It is in the main developed by repeated acts of attention upon the subject in hand_. If I am anxious or need to develop the power of concentration upon what people say, either in conversation or in public discourse, I may be helped by persistently and continuously forcing myself to attend. The habit of concentration may to a degree be thus acquired; <p 120> pursuing it, I should never allow myself to listen indifferently, but I must force myself to strict attention. Such practice would result ultimately in a habit of concentration upon what I hear, but would not necessarily increase my power of concentration upon writing, adding, or other activities. Specific training in each is essential, and even then the results will be far short of what might be desired. Persistent effort in any direction is not without result, however, and any increase in concentration is so valuable that it is worth the effort it costs. If a man lacks power of concentration in any particular direction, he should force concentration in that line and continue till a habit results. Our control over our muscles and movements far exceeds our direct control over our attention. An attitude of concentration is possible, even when the desired mental process is not present. Thus by fixing my eyes on a page and keeping them adjusted for reading, even when my mind is on a subject far removed, I can help my will to secure concentration. I <p 121> can likewise restrain myself from picking up a newspaper or from chatting with a friend when it is the time for concentrated action on my work. By continuously resisting movements which tend to distract and by holding myself in the position of attention, the strain upon my will in forcing concentration becomes less. _Concentration is practically impossible when the brain is fagged or the bodily condition is far below the normal in any respect_. The connection between the body and the mind is most intimate, and the perfect working of the body is necessary to the highest efficiency of the mind. The power of concentration is accordingly affected by surroundings in the hours of labor, by sleep and recreation, by the quality and quantity of food, and by every condition which affects the bodily processes favorably.