In Denmark they feed cows scientifically. Day by day they increase
the allowance of milk-producing food. Day by day the yield of milk
increases. At last there comes a day when measurement shows that there
is no longer any increase in the production of milk. They then
decrease the food till the output of milk diminishes. So they
determine the normal.

So with you and your hours of work and leisure. Give more and more
time to your business each day until there comes an impairment in the
quality of your work. Stop short of this. You have found your norm of
efficiency.




CHAPTER V

THE SECRET OF MENTAL EFFICIENCY


[Sidenote: Where Energy Is Stored]

You are called upon to master and conserve the innate energies of your
mind. This means that you must (1) find out where these energies are
stored, and (2) learn the conditions that determine their activity.

_All past experiences are conserved within us in the form of
complexes. These complexes consist of ideas, emotions and impulses to
muscular activity. By the primary law of association the recall to