back of the head, the nape of the neck, the pit of the
stomach, the summit of the head, above and between the eyes,
and in one case near the right shoulder but beyond the periphery
of the body. The explanation appears to be that the nervo-vital
emanations from the body of the seer act upon the static odyle in
the agent, which in turn reacts upon the brain centres by means of
the optic nerves. And this appears to be sufficient reason why the
crystal or mirror should be kept as free as possible from
disturbing elements. Water is extremely odylic and should never
come in contact with the agent employed as it effectually carries
off all latent or stored imports. I am forced to use a crude
terminology in order to convey the idea in my mind, but I
recognize that the whole explanation may appear vague and
inadequate. It is of course at all times easier to observe effects
than to offer a clear explanation of them. Yet some sort of
working hypothesis is constructed when we collate our observations,
and it is this that I have sought to communicate.

For similar reasons, when in use the crystal or mirror should be
shaded and so placed that no direct rays from sun or artificial
light may fall upon it. The odyle, as Reichenbach so conclusively
proved by his experiments, rapidly responds to surrounding
magnetic conditions and to the vibrations of surrounding bodies,
and to none more rapidly than the etheric vibrations caused by
combustion or light of any kind. There should be no direct rays of
light between the agent and the seer.

The room in which the sitting takes place should be moderately
warm, shady, and lit by a diffused light, such as may be obtained
by a light holland blind or casement cloth, in the daytime. The
subject should sit with his back to the source of light, and the
illumination will be adequate if ordinary print can be read by it.

It is important that all persons sitting in the same room with the
seer should be at least at arm's length from him.

Silence should be uniformly observed by those present, until the
vision is attained.

It will then be found convenient to have two persons present to
act as Interrogator and Recorder respectively.

The Interrogator should be the only person whose voice is heard,
and it should be reduced to a soft but distinct monotone. The
Recorder will be occupied in setting down in writing all questions
asked by the Interrogator and the exact answers made by the
seer. These s