PREFACE, 39 the agency of a wire and a cell he can hear the voice of his fellow across a thousand miles. Marconi has shown us that we can dispense with the wire. Who knows whether we may not some day dispense with the cell ? The discovery of radium, which revolutionized in an hour the fundamental principles of material science, may have its counterpart in the dis- coveries which are yet to be made within the dim and comparatively unexplored hinterland of the human consciousness. All students agree that there are almost illimitable potentialities in the human ego. There may be a whole new continent within ourselves waiting for the advent of some new Columbus to make its treasures available, and to reveal its wonders. The value of this book is that it affords well- attested evidence as to the existence of certain faculties in a certain living and accessible human being, the use of which the average man has not yet mastered. It may be that these faculties are peculiar to this particular unit of the genus Aomo. If this be the case, he is at least as worthy of serious scientific examination as any other /usus maturae. Imagine the sensation that would be occasioned at the British Association if a descendant of the ancient Cyclops were produced, with a