into more definite and usable shape, so the conscious mind lays hold of
them and induces a corresponding vibratory current in the voluntary system
of nerves, and this in turn induces a similar current in the involuntary
system, thus handing the idea over to the subjective mind. The vibratory
current which had first descended from the apex of the brain to the frontal
brain and thus through the voluntary system to the solar plexus is now
reversed and ascends from the solar plexus through the sympathetic system
to the posterior brain, this return current indicating the action of the
subjective mind.

If we were to remove the surface portion of the apex of the brain we should
find immediately below it the shining belt of brain substance called the
"corpus callosum." This is the point of union between the subjective and
objective, and as the current returns from the solar plexus to this point
it is restored to the objective portion of the brain in a fresh form which
it has acquired by the silent alchemy of the subjective mind. Thus the
conception which was at first only vaguely recognized is restored to the
objective mind in a definite and workable form, and then the objective
mind, acting through the frontal brain--the area of comparison and
analysis--proceeds to work upon a clearly perceived idea and to bring out
the potentialities that are latent in it.

It must of course be borne in mind that I am here speaking of the mental
ego in that, mode of its existence with which we are most familiar, that is
as clothed in flesh, though there may be much to say as to other modes of
its activity. But for our daily life we have to consider ourselves as we
are in that aspect of life, and from this point of view the physiological
correspondence of the body to the action of the mind is an important item;
and therefore, although we must always remember that the origin of ideas is
purely mental, we must not forget that on the physical plane every mental