=Limitations of Habit.=--From what has here been learned concerning the formation of physical habits, it becomes evident that there are limitations to these as forms of reaction. Since any habit is largely an unconscious reaction to a particular situation, its value will be conditional upon the nature of the circumstances which call forth the reaction. These circumstances must occur quite often under almost identical conditions, otherwise the habit can have no value in directing our social conduct. On the contrary, it may seriously interfere with successful effort. For the player to habituate his hands to fingering the violin is very important, because this is a case where such constant conditions are to be met. For a salesman to habituate himself to one mode of presenting goods to his customers would be fatal, since both the character and the needs of the customers are so varied that no permanent form of approach could be effective in all cases. To habituate ourselves to some narrow automatic line of action and follow it even under varying circumstances, therefore, might prevent the mind from properly weighing these varying conditions, and thus deaden initiative. It is for this reason that experience is so valuable in directing life action. By the use of past experience, the mind is able to analyse each situation calling for reaction and, by noting any unusual circumstances it presents, may adapt even our habitual reactions to the particular conditions. The relation of habit to interest and attention is treated in Chapter XXIV. CHAPTER XXIII ATTENTION