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832. _Regularity is very important in exercising the moral and
intellectual powers._ Periodicity, or a tendency to resume the same
mode of action at stated times, is peculiarly the characteristic of
the nervous system. If we repeat any kind of mental effort every day
at the same hour, we at last find ourselves entering upon it without
premeditation when the time approaches. In like manner, if we arrange
our studies in accordance with this law, and take up each in the same
order, a natural aptitude is soon produced, which renders application
more easy than by resuming the subjects as accident may direct.

_Observation._ When engaged in abstruse studies, it may be found
advantageous to pursue others that are less difficult. The intense
application of the brain, which is requisite in the one instance, is
relieved by directing the attention to a study that requires less
thought. By this change, there is mental relaxation attended with
invigoration of the cerebral organ. Or, it may be explained by
assuming, that the brain is composed of an aggregate of distinct
organs, each of which is called into action in pursuing different
studies.

833. Effective study is impossible if the powers of the brain are
depressed. When the cerebral organ has been temporarily debilitated by
protracted intellectual efforts, it is ineffectual to attempt any
concentrated mental exercise. This condition of the nervous system is
indicated by confusion of thought and inability to attain results that
usually follow similar efforts. Mental rest in these cases is
required.

_Observation._ Students frequently fail in solving mathematical
problems when the mind is prostrated by continued and excessive effort
to obtain a solution. Not unfrequently after a night's rest the
problem is quickly solved, and the pupil thinks he "dreamed it out."
The true explanation is rest invigorated the exhausted brain, which
fitted it for vigorous and successful thought.

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832. Why is regularity of great importance in exercising the moral and
intellectual powers? What suggestion when pursuing abstruse studies?
How explained? 833. When is effective study impossible? How is this
condition of the nervous system indicated?

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834. _The intellect should not be cultivated to the neglect of the
moral and physical powers._ All the faculties require for their
development regular exercise, alternate