We have different kinds of nerves of feeling.
13.

There are other nerves besides those of feeling.

These are nerves of work.
14.

The nerves of work have charge of the heart, the lungs, the muscles, the liver, the stomach, and every part of the body which can work or act.
15.

The brain and nerves control the body and make all the different parts work together in harmony, just as a general controls an army.
16.