Psychic Force
Various explanations of the power employed by the spirits, assisted by
the medium and by the circle, have been offered by the scientific
investigators of the subject. The most generally accepted theory of the
western scientists is that the spirits employ what is called the
"psychic force" of the medium, often assisted by that drawn from the
circle and focused in the medium. The medium is regarded as a psychic
storage battery which is freely drawn upon by the manifesting spirit.
The degree and character of the manifestations are determined largely by
the peculiar quality of the psychic force, the capabilities of the
medium, the knowledge and powers of the spirits, and the influence of
the sitters.