Emil Kraepelin Quotes
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To a certain extent the dangers of mental overwork have been recognized for a long time. All those efforts to introduce physical exercises into the school hours have in view, to a greater or less extent, the defense of the childish brain against the imminent dangers of a one-sided tension by alternating mental and muscular exertion.
The mental vigor of most men is usually maintained at a certain height for the longest time in the forenoon. The evidences of fatigue come on later at this time of day than in the evening, when the store of force in our brain has been already considerably drawn upon by the whole day's work.