First published in 1938, presents a comprehensive overview of diverse field of phenomena which is included under the heading of psychical research. Psychical research does not deal in Spiritualism or ‘Spooks’. It is the scientific investigation of the hidden faculties of Man, and it constitutes the main pathway to the understanding of the Human Individual. Since second half of nineteenth century, unknown to the general public, careful work with new methods has been going on, and the results when properly understood, are as startling as they are important. The present volume summarizes the work and discusses the far-reaching conclusion to which it points. This book is an important historical document for scholars and researchers of religion, psychology, philosophy of mind and psychic studies.