In this volume, the perplexing manifestations on spiritism and psychology are treated in a manner at once daring and original, and with an impartiality rarely met with in high scientific circles. The author's standpoint is that spiritism (the belief in communication with spirits of the dead) is a "fallacy," yet at the same time he acknowledges the existence of telepathy, clairvoyance, telekinesis, materialization, and other supernormal phenomena which are not, as yet, recognized by official science.