Test of post-mortem survival in which the solution to a secret cipher made before death is to be communicated through a medium or other psychic practitioner. For more, see: PE: Envelope, Cipher and Lock Tests of Survival · SPR glossary.
Test of post-mortem survival in which the solution to a secret cipher made before death is to be communicated through a medium or other psychic practitioner. For more, see: PE: Envelope, Cipher and Lock Tests of Survival · SPR glossary.