This book is the first of a series with the title 'Parapsychological Library', edited by two teachers of psychology, Dietz and Tenhaeff. The second volume will be entitled 'Spiritualism'.

It must be stated in advance that, according to the author, telepathy, clairvoyance, prophecy (clairvoyance of future happenings) and retrograde Psychoskopie (clairvoyance of past events) are well established facts. With this book he tries to give further scientific proof of the existence of these phenomena and to offer theoretical reasons for the possibility of their existence.

Telepathy is the reception of a message by one person from another human being or even from animals, especially a dog, without the means of the sense organs. The message may reach the receiving person even in a very distant part of the globe at the very