Knowledge and affords evidence of telepathic communication (see Telepathy) between living persons.
If the process commonly styled "telepathy" exists (see Telepathy), that may account for the scryer's power of seeing facts which are in the mind of the inquirer.
But when the scryers see details of various sorts, which are unknown to the inquirer, but are verified on inquiry, then telepathy perhaps fails to provide an explanation.
Telepathy or clairvoyance, with or without trance, must have operated powerfully to produce a conviction of the dual nature of man, for it seems probable that facts unknown to the automatist are sometimes discovered by means of crystal-gazing, which is widely found among savages, as among civilized peoples.
(See Telepathy.) Both among civilized and uncivilized peoples there is a widespread belief that the apparition of a living person is an omen of death; but until the Society of Psychical Research undertook the statistical examination of the question, there were no data for estimating the value of the belief.