Experiments conducted by Burgerstein[48] and at Leland Stanford Junior University[49] emphasize a particular phase of this principle--that too long continued mental application without relaxation induces fatigue more readily than when there are comparatively short periods of effort, followed by intermissions of rest. Thus when pupils (and the younger they are the more is this true) have a given amount of work to do requiring their attention say for an hour and a half they will accomplish most with least waste of energy by breaking up this long stretch into several parts, interspersing a few minutes of free play. With adults application may profitably continue for longer periods, but even here the rhythm of concentration and relaxation must be observed in order that effort may have the most fruitful issue. There would assuredly be less dullness, carelessness, and disorder in our schools, high and low, and in our homes, if this law were observed in the arrangement of the activities of daily life. The writer knows of a normal school where the work begins at half past eight in the morning and continues until one o'clock, with a pause of only ten minutes in the middle of the session. During the passage of classes from room to room at the close of recitations, monitors are placed in the halls to prevent any exhibition of freedom in communicating with one another or in the movements of the body. Here there is little if any relief to the attention, since pupils are under practically the same constraint as when reciting in Latin, Greek, or geometry. This enthronement of discipline, which we all seem natively to think necessary that we may prevent the reversionary tendencies of youth, is sure to breed in some measure the very maladies--stupidity and disorder--which various agencies in society are striving to cure by all sorts of formulæ. [Footnote 48: _Op. cit._] [Footnote 49: Pedagogical Seminary, vol. iii, pp. 213 _et seq._]