within the cranial cavity and the spinal canal, viz., the brain and
the spinal cord, together with the nerves which branch off from the
same. This system presides over the functions of animal life known as
volition, sensation, etc. The Sympathetic System includes all that
part of the Nervous System located principally in the thoracic,
abdominal and pelvic cavities, and which is distributed to the
internal organs. It has control over the involuntary processes, such
as growth, nutrition, etc.

The Cerebro-Spinal System attends to all the seeing, hearing, tasting,
smelling, feeling, etc. It sets things in motion; it is used by the
Ego to think--to manifest consciousness. It is the instrument with
which the Ego communicates with the outside world. This system may be
likened to a telephone system, with the brain as the central office,
and the spinal column and nerves as cable and wires respectively.

The brain is a great mass of nerve tissue, and consists of three
parts, viz., the Cerebrum or brain proper, which occupies the upper,
front, middle and back portion of the skull; the Cerebellum, or
"little brain," which fills the lower and back portion of the skull;
and the Medulla Oblongata, which Is the broadened commencement of the
spinal cord, lying before and in front of the Cerebellum.

The Cerebrum is the organ of that part of the mind which manifests
itself in intellectual action. The Cerebellum regulates the movements
of the voluntary muscles. The Medulla Oblongata is the upper enlarged
end of the spinal cord, and from it and the Cerebrum branch forth the
Cranial Nerves which reach to various parts of the head, to the organs
of special sense, and to some of the thoracic and abdominal organs,
and to the organs of respiration.