The Problems of Psychical Research

The present edition of this book is to some extent an abridgement of the first edition, which appeared some seven years ago. I have, for instance, omitted a number of "cases" which were originally included, and also my "sittings" with Mrs. Piper—which material will be published at a later date in another volume. I have also omitted the original First Chapter,—since much of this material was subsequently included in my Modern Psychical Phenomena.

On the other hand, I have included a new chapter on Recent Experiments in Psychic Photography,—composed partly of original and hitherto unpublished material, and partly of the experiments undertaken, some years ago, by Dr. Baraduc,—in "photographing the soul." The account of his experiments was originally published in my book, Death: its Causes and Phenomena, but they are now included here as being more in line with other experiments recently undertaken in this field. I have also added a brief chapter on the Scientific Investigation of Psychic Phenomena by means of Laboratory Instruments.