The mind thus knows that more clothing is needed, and
_wills_ to have the eyes look for it, and the hands and feet move
to get it. This is done by the nerves of sight and of motion.
Next are the nerves of _involuntary motion_, which move all those
parts of the head, face, and body that are used in breathing, and in
other operations connected with it. By these we continue to breathe
when asleep, and whether we will to do so or not. There are also some
of the nerves of voluntary motion that are mixed with these, which
enable the mind to stop respiration, or to regulate it to a certain
extent. But the mind has no power to stop it for any great length of
time.
There is another large and important system of nerves called the
_sympathetic_ or _ganglionic_ system. It consists of small masses of
gray and white nervous matter, that seem to be small brains with nerves
running from them. These are called _ganglia_, and are arranged on each
side of the spine, while small nerves from the spinal marrow run into
them, thus uniting the sympathetic system with the nerves of the spine.
These ganglia are also distributed around in various parts of the
interior of the body, especially in the intestines, and all the
different ganglia are connected with each other by nerves, thus making
one system.
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