The reliable bookkeeper has reduced to habit the combining of all the ordinary sums of the ledger. The man of accuracy of speech <p 315> is the one whose thoughts clothe themselves in the verbal expressions by habit but with no conscious selection of words. The man of the most accurate judgment in any field is the one who has succeeded in reducing to habit most of the steps of the judgments in that field, the one who has the largest stock of intuitive judgment. HABIT RELIEVES THE ATTENTION FROM DETAILS Attention cannot be directed to more than one thing at a time. It is doubtless true that the ``one thing'' may be very complex, _e.g_. four letters or even four words. So long as the performance of an act demands attention, this one act is practically all that can be done at that time. As soon as this thing is reduced to habit, it may go on automatically, and the attention may be turned to other things. When I begin to learn to play the piano, the finger movements require all my attention so that I cannot read the notes on the scale and make the proper execution at the <p 316> same time. Gradually, the reading of notes and the execution are reduced to habit, and I can then turn my attention to the reading of the words of the air. As each essential detail is reduced to habit, I acquire the ability to read the score, to make the correct finger and foot movements, to read the words of the song, to sing it correctly, and at the same time to be thinking more or less of other things. My use of the pen has become so reduced to habit that I need pay no attention to the writing, but am enabled to give my entire attention to the thought which I am attempting to formulate. So every useful habit becomes a power or a tool which may be used for multiplying the efficiency of the individual. Habit formation is the greatest labor saving device in the human economy. No one has expressed this truth so forcefully as the late Professor William James.