he 'strong will' that helps telepathy so much as clear
thinking."

As to the subject or _percipient_, experience has taught us that the
four following states are probably the most important for the recipience
of a telepathic message:

1. In the state of profound _aideia_ (complete lack of thought)
transmission is never immediate, but it may sometimes be latent.

2. In the state of nascent _monoideism_ (one idea) it may be immediate
and perfect.

3. In the state of _passive polyideism_ (many thoughts) it may be
either immediate or may take place after an interval of greater or
lesser length.

4. In the state of _active polyideism_ the conditions are complex and
subject to further subdivisions, for:

(_a_) Transmission may be direct if the subject helps by voluntary
self-absorption in a concentration of mind more or less monoideic; he
lends himself to the action; he listens mentally; he seeks, sometimes he
finds!

(_b_) It may be indirect, i.e. latent; this time also with some
concurrence on the part of the subject. This seems more frequent.

(_c_) Finally, it may in exceptional instances be either mediate
(delayed) or immediate, even without the subject's being advised
beforehand of the action.

* * * * *

Here, then, are the probable conditions; also the state of the agent and
percipient. Now what about the _connecting links_?

Here we come to the heart of the problem. I shall be as brief as
possible, since we cannot pretend that the problem is yet solved. I
merely offer a few suggestions, some original, others advanced before by
writers on these subjects.[44]

In order to obtain a specific action we must employ a specific
instrument: a telephone for a telephone; a brain for a brain.

Every living thing is a dynamic focus.

A dynamic focus tends ever to propagate the motion which is proper to
it.

Propagated motion becomes transformed according to the medium it
traverses. A force may be transmitted or transformed.

In an identical medium there is only _transmission_.

In a different medium there is _transformation_.

A dynamic nucleus, in propagating its motion, sends it out in every
direction; but this transmission becomes perceptible only on the lines
of least resistance.

A process that is at once chemical, physical, and psychical goes on in
the brain. A complex action of this kind is propagated through the grey
matter, as waves are propagated in water.

Regarded