physiologically, a thought is only a vibration, probably, which
does not pass out of its appropriate medium. It is propagated, and it
must be along the motor nerves, since science admits no other route. But
the _thought itself_ does not radiate; it remains "at home," just as the
chemical action of a battery remains in the battery; it is represented
abroad by its dynamic correlate, called, in the case of the battery, a
_current_; and in the case of the brain, I know not what; but whatever
its name may be, it is the _dynamic correlate of thought_. Thought,
therefore, is dynamic. Thought is transformed; and may be
re-transformed, in another organism which supplies the necessary
conditions. Thought may be restored.

We have now reached, from a purely physiological standpoint, a position
which I desired to reach before I advance the final part of the
theory--which may at first sight appear somewhat fantastic. But
telepathy itself is fantastic; and yet, being a fact, it must be
accounted for somehow, or left altogether unexplained.

It has always been contended by a peculiarly-gifted group of individuals
known as "clairvoyants," that we possess a "spiritual body"--just as we
possess a physical body--of exactly the same shape and appearance; and
that we inhabit this body at death. It is further contended that all our
physical senses find their exact counterpart in this "etheric double";
there is a physical eye and a spiritual eye; a physical ear and a
spiritual ear, etc. With the spiritual eye we see "clairvoyantly"; with
the spiritual ear we hear "clairaudiently," and so forth. I shall not
discuss the possibility of such a body, except to say that there is now
a mass of evidence in its favour. Assuming it to exist--assuming it to
be the exact counterpart of the physical body--then it too possesses a
brain; and it too must pulsate and vibrate just as the physical brain
does, when accompanying thought.

Now this inner body may be the _vehicle of thought_. It may possess
"centres" whose normal office is to send and receive telepathic
messages. One "etheric centre" may thus act upon another "etheric
centre" directly--only indirectly upon the physical brain cells. The
action would thus be dynamic, yet psychical; physical in a sense, yet
not physical as we conceive it. Philosophy tells us that the table we
see (the _phenomenon_) is not the "real" table (the _noumenon_)--the
reality behind; but, if we knock the two tables together