ld we use the word "in" to
express this relation?

The body is a certain group of phenomena in the objective order; that
is, it is a part of the external world. The mind consists of
experiences in the subjective order. We have seen that no mental
phenomenon can occupy space--real space, the space of the external
world--and that it cannot even have a position in space (section 34).
As mental, it is excluded from the objective order altogether. The
mind is not, then, strictly speaking, _in_ the body, although it is
related to it. It remains, of course, to ask ourselves how we ought to
conceive the relation. This we shall do later in the present chapter.

But, it may be said, it would sound odd to deny that the mind is in the
body. Does not every one use the expression? What can we substitute
for it? I answer: If it is convenient to use the expression let us
continue to do so. Men must talk so as to be understood. But let us
not perpetuate error, and, as occasion demands it, let us make clear to
ourselves and to others what we have a right to understand by this _in_
when we use it.

36. THE DOCTRINE OF THE INTERACTIONIST.--There is no man who does not
know that his mind is related to his body as it is not to other
material things. We open our eyes, and we see things; we stretch out
our hand, and we feel them; our body receives a blow, and we feel pain;
we wish to move, and the muscles are set in motion.

These things are matters of common experience. We all perceive, in
other words, that there is an interaction, in some sense of the term,
between mind and body.

But it is important to realize that one may be quite well aware of all
such facts, and yet may have very vague notions of what one means by
body and by mind, and may have no definite theory at all of the sort of
relation that obtains between them. The philosopher tries to attain to
a clearer conception of these things. His task, be it remembered, is
to analyze and explain, not to deny, the experiences which are the
common property of mankind.

In the present day the two theories of the relation of mind and body
that divide the field between them and stand opposed to each other are
_interactionism_ and _parallelism_. I have used the word "interaction"
a little above in a loose sense to indicate our common experience of
the fact that we become conscious of certain changes brought about in
our body, and that our purposes realize themselves in act