The Unknown Guest

The author surveys reports and investigations of psychical phenomena, classifying and analyzing occurrences such as table-turning and raps, movements and transportations of objects without contact, luminous phenomena, clairvoyance and precognition, veridical apparitions and haunted houses, bilocations and communications with the dead, divining-rod experiences, miraculous cures and curious animal intelligence. He examines methods of inquiry, the frequent role of mediumship, the recurrent exposure of fraud, and the cautious conclusions reached by contemporary psychical research, suggesting that these residual phenomena indicate an unknown region of experience rather than supplying definitive explanations.