Thus, also, the thinking portion of the brain may be so overworked as
to drain the nervous fluid from other portions, which become debilitated
by the loss. And in this way, also, the overworked portion may be
diseased or paralyzed by the excess.
The necessity for the _equal development_ of all portions of the brain
by an appropriate exercise of _all_ the faculties of mind and body, and
the influence of this upon happiness, is the most important portion of
this subject, and will be more directly exhibited in another chapter.
VIII.
DOMESTIC EXERCISE.
In a work which aims to influence women to train the young to honor
domestic labor and to seek healthful exercise in home pursuits, there
is special reason for explaining the construction of the muscles and
their connection with the nerves, these being the chief organs of
motion.
The muscles, as seen by the naked eye, consist of very fine fibres or
strings, bound up in smooth, silky casings of thin membrane. But each
of these visible fibres or strings the microscope shows to be made up
of still finer strings, numbering from five to eight hundred in each
fibre.
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