feeling, and now of willing, but some of each is always
present in our consciousness. The nature of these different elements in
our mental stream, their relation to each other, and the manner in which
they all work together in amazing perplexity yet in perfect harmony to
produce the wonderful _mind_, will constitute the subject-matter we
shall consider together in the pages which follow.

4. WHERE CONSCIOUSNESS RESIDES

I--the conscious self--dwell somewhere in this body, but where? When my
finger tips touch the object I wish to examine, I seem to be in them.
When the brain grows weary from overstudy, I seem to be in it. When the
heart throbs, the breath comes quick, and the muscles grow tense from
noble resolve or strong emotion, I seem to be in them all. When, filled
with the buoyant life of vigorous youth, every fiber and nerve is
a-tingle with health and enthusiasm, I live in every part of my
marvelous body. Small wonder that the ancients located the soul at one
time in the heart, at another in the pineal gland of the brain, and at
another made it coextensive with the body!

CONSCIOUSNESS WORKS THROUGH THE NERVOUS SYSTEM.--Later science has
taught that the _mind resides in and works through the nervous system,
which has its central office in the brain_. And the reason why _I_ seem
to be in every part of my body is because the nervous system extends to
every part, carrying messages of sight or sound or touch to the brain,
and bearing in return orders for movements, which set the feet a-dancing
or the fingers a-tingling. But more of this later.

This partnership between mind and body is very close. Just how it
happens that spirit may inhabit matter we may not know. But certain it
is that they interact on each other. What will hinder the growth of one
will handicap the other, and what favors the development of either will
help both. The methods of their cooeperation and the laws that govern
their relationship will develop as our study goes on.

5. PROBLEMS IN OBSERVATION AND INTROSPECTION

One should always keep in mind that psychology is essentially a
laboratory science, and not a text-book subject. The laboratory material
is to be found in ourselves and in those about us. While the text should
be thoroughly mastered, its statements should always be verified by
reference to one's own experience, and observation of others. Especially
should prospective teachers constantly correlate the lessons of the book
wit