whom I had a conversation a few days before his unfortunate and terrible death. My mediumistic experiences with Mme. Paladino formed for him a new chapter in the great book of nature, and he also was convinced that there exist hidden forces to the investigation of which it is not unscientific to consecrate one's self. His subtle and penetrating genius would perhaps have quickly determined the character of these forces.

Those who have given some little attention to these psychological studies are acquainted with the powers of Mme. Paladino. The published works of Count de Rochas, of Professor Richet, of Dr. Dariex, of M. G. de Fontenay, and notably the Annales des sciences psychiques, have pointed them out and described them in such detail that it would be superfluous to recur to them at this point. Farther on we shall find a place for discussing them.

Running underneath all the observations of the above-mentioned writers, one dominant idea can be read as if in palimpsest; namely, the imperious necessity the experimenters are constantly under of suspecting tricks in this medium (Mme. Paladino). But all mediums, men and women, have to be watched. During a period of more than forty years I believe that I have received at my home nearly all of them, men and women of divers nationalities and from every quarter of the globe. One may lay it down as a principle that all professional mediums cheat. But they do not always cheat; and they possess real, undeniable psychic powers.

Their case is nearly that of the hysterical folk under observation at the Salpêtrière or elsewhere. I have seen some of them outwit with their profound craft not only Dr. Charcot, but especially Dr. Luys, and all the physicians who were making a study of their case. But, because hysteriacs deceive and simulate, it would be a gross error to conclude that hysteria does not exist. And, because mediums frequently descend to the most brazen-faced imposture, it would not be less absurd to conclude that mediumship has no existence. Disreputable somnambulists do not forbid the existence of magnetism, hypnotism, and genuine somnambulism.

This necessity of being constantly on our guard has discouraged more than one investigator, as the illustrious astronomer Schiaparelli, director of the Observatory of Milan, specially wrote me, in a letter which will appear farther on.

Still, we have got to endure this evil.

The words "fraud" (supercherie) and "trickery" (tricherie) have in this connection a sense a little different from their ordinary meaning. Sometimes the mediums deceive purposely, knowing well what they are doing, and enjoying the fun. But oftener they unconsciously deceive, impelled by the desire to produce the phenomena that people are expecting.

They help on the success of the experiment when that success is slow in its appearance. Mediums who deal with objective phenomena are gifted with the power of causing objects at a distance to move, of lifting tables, etc. But they usually appear to apply this power at the ends of their fingers, and the objects to be moved have to be within reach of their hands or feet, a very regrettable thing, and one which furnishes fine sport for the prejudiced sceptics. Sometimes the mediums act like the billiard player, who continues for an instant the gesture of hand and arm, holding his cue pointed at the rolling ivory ball, and leaning forward as if by his will he could push it to a carom. He knows very well that he has no further power over the fate of the ball, which his initial stroke alone impels; but he guides its course by his thought and his gesture.

It may not be superfluous to caution the reader that the word "medium" is employed in these pages without any preconceived idea, and not in the etymological sense in which it took its rise at the time of the first Spiritualistic theories, which affirmed that the man or the woman endowed with psychic powers is an intermediary between spirits and those who are experimenting. The person who has the power of causing objects to move contrary to the laws of gravity (even sometimes without touching them), of causing sounds to be heard at a distance and without any exertion of muscular force, and of bringing before the eyes various apparitions, has not necessarily, on that account, any bond of union with disembodied minds or souls. We shall keep this word "medium," however, now so long in use. We are concerned here only with facts. I hope to convince the reader that these things really exist, and are neither illusions nor farces, nor feats of prestidigitation. My object is to prove their reality with absolute certainty, to do for them what (in my volume The Unknown and the Psychic Problems) I have done for telepathy, the apparitions of the dying, premonitory dreams, and clairvoyance.

I shall begin, I repeat, with experiments which I have recently renewed; namely, during four séances on March 29, April 5, May 30, and June 7, of 1906.

1. Take the case of the levitation of a round table. I have so often seen a rather heavy table lifted to a height of eight, twelve, sixteen inches from the floor, and I have taken such undeniably authentic photographs of these; I have so often proved to myself that the suspension of this article of furniture by the imposition upon it of the hands of four or five persons produces the effect of a floating in a tub full of water or other elastic fluid, that, for me, the levitation of objects is no more doubtful than that of a pair of scissors lifted by the aid of a magnet. But one evening when I was almost alone with Eusapia, March 29, 1906 (there were four of us altogether), being desirous of examining at leisure how the thing was done, I asked her to place her hands with mine upon the table, the other persons remaining at a distance. The table very soon rose to a height of fifteen or twenty inches while we were both standing. At the moment of the production of the phenomenon the medium placed one of her hands on one of mine, which she pressed energetically, our two other hands resting side by side. Moreover, on her part, as on mine, there was an act of will expressed in words of command addressed to "the spirit": "Come now! Lift the table! Take courage! Come! Try now!" etc.

We ascertained at once that there were two elements or constituents present. On the one hand, the experimenters address an invisible entity. On the other hand, the medium experiences a nervous and muscular fatigue, and her weight increases in proportion to that of the object lifted (but not in exact proportion).

We are obliged to act as if there really were a being present who is listening. This being appears to come into existence, and then become non-existent as soon as the experiment is ended. It seems to be created by the medium. Is it an auto-suggestion of hers or of the dynamic ensemble of the experimenters that creates a special force? Is it a doubling of her personality? Is it the condensation of a psychic milieu in the midst of which we live? If we seek to obtain proofs of actual and permanent individuality, and above all of the identity of a particular soul called up in our memory, we never obtain any satisfaction. There lies the mystery.

Conclusion: we have here an unknown force of the psychic class, a living force, the life of a moment only.

May it not be possible that, in exerting ourselves, we give rise to a detachment of forces which acts exteriorly to our body? But this is not the place, in these first pages, to make hypotheses.

The experiment of which I have just spoken was repeated three times running, in the full light of a gas chandelier, and under the same conditions of complete proof in each case. A round table weighing about fourteen pounds is lifted by this unknown force. A