d with intervals of rest. This
is as necessary to the due development of the moral feelings of a
child as in physical training and mental culture. Consequently, those
schools are to be preferred in the education of youth, where the
physical, intellectual, and moral faculties receive each day a due
share of attention and culture.

835. The continuance of healthy and vigorous action in the matured
physical, mental, and moral powers, requires frequent and regular
action, alternated with rest, as much as in their development.
Consequently, those who cultivate one or two of these faculties, to
the neglect of the others, exhibit a marked deficiency of acuteness
and vigor in those not exercised. This defect reacts on the powers
that are vigorous, diminishing the energy and deteriorating all the
other faculties of man.

_Observations._ 1st. If the principles before mentioned are true, the
adult, as well as the child, should spend a part of each day in some
proper physical employment; another portion should be appropriated to
intellectual pursuits; while another should be sedulously devoted to
the cultivation of the moral feelings.

2d. Disease of the corporeal system more frequently occurs when only
one set of faculties is used than when all are equally employed. This
is particularly true of nervous and mental disease, which follows and
is caused by either high intellectual action, or intense moral
emotions, without a due amount of physical exercise.

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How is the "dreaming out" of problems explained? 834. What is said of
the culture of the intellect? What schools are preferable in the
education of youth? Why? 835. What is the effect of cultivating only
one faculty of the mind? Give observation 1st. Observation 2d.

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836. _The brain can exercise its full force upon only one object at a
time._ If its energies are directed to two or more operations, neither
will receive that full power of exertion that it would if only one
object had engaged the mind. Although the brain will direct several
operations at the same time when only slight mental effort is
required, yet when one operation becomes difficult, or demands special
attention of the mind, the other will be suspended. This is
illustrated in social conversation while walking. Let it become
necessary to concentrate the nervous power upon the motor organs, and
the conversation declines or ceases.

837. In acquiring a