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thought calls into operation and activates certain sets of brain cells - the other cells of course taking a rest in the meantime. This being the case, you will see, readily, that when one set of brain cells become utterly fagged out by excessive exercises and work, its only chance of getting an entire rest is for you to concenter upon an entirely different line of thought, shutting out the cells which you have just tired out, and which are still vibrating with excitement from the strong impetus given them. By concentering upon the new thought, the old cells are relieved from further work and obtain a much-needed rest. These cells are hungry for work, and may attempt to return to their task in spite of you, but if you have acquired proficiency in the art of concentering, you have learned to master them. You doubtless remember the time when your brain felt exhausted by the hard work of the business day, but when you pickup up an interesting novel you became so interested in it that your old brain cells "knocked off" for a while, and when the novel was completed you felt completely refreshed, not withstanding the fact that the reading of the book was in itself no slight exercises of the mind. That is the theory. Now, put it into practice, and you will have no need to complain of mental overwork. You will be able to put thoughts off and on, like your coat, changing them whenever you see fit.

I will now give you a few exercises, the practice of which will enable you to develop the power of concentering. In leaving this phase of the subject, I again would remind you that the underlying principle of concentering is the focusing of the attention upon a certain thought or action. Any exercise, which will strengthen the faculty of volitional inhibition of non-essential thought, will be of value, the exercises herein given here being merely furnished as suggestions of others.