In obscurity, the means of cheating are unimaginable. I saw a young medium, who had succeeded in concealing a stick, simulate raps on the ceiling with it. I have known two others hit the table with their fists, kick it with their feet, etc. Everything is possible in darkness, and with certain confiding observers. (_b_) _Parakinesis_, or abnormal movements of objects with contact. I have often said that all movements with contact—except certain levitations which are, however, difficult to observe with precision—are worthless. I have indicated the chief ways of simulating levitations, either by the hands, the feet or the knees. I will not revert to this. These methods are difficult in full light, but when the experimenters are placed in such a position as to be unable to keep a reciprocal watch over the feet, the second method is still easily brought into play. (_c_) _Telekinesis._—Fraud is more difficult to perpetrate here. A connecting link of some kind or other would be required to move objects possessing a certain weight and bulk. I look upon this phenomenon as most convincing, when it is obtained in full light; in obscurity, it is to a certain extent unverifiable. (_d_) _Luminous phenomena_ are easily simulated; phosphorescent oil and certain sulphides give excellent imitations of hands and forms. I have seen a photograph taken by magnesian light in a seance for materialisation. The medium, by way of imitating a materialised garment of some kind, had wound a white cloth around his neck, and moreover wore a false beard. Those present at this seance will not admit they were cheated. One of the sitters, a friend of mine, one familiar with psychical matters, but too honest himself to suspect fraud in others, did not think my judgment in this case was correct. It was necessary to have it confirmed by the celebrated Papus! As for the phenomenon of _attouchements_, this is of all phenomena the most easily simulated in obscurity. Every one knows the rôle played by dolls, disguises and confederates in seances for materialisation. The trickster’s imagination is of inconceivable fertility. The recent Rothe trial gives us a fresh example of this. (_e_) _Motor and sensory automatisms_ can be imitated with extreme facility, and their efficacious control is impossible. A careful analysis of the messages is necessary in order to appreciate their value. On the other hand, well-observed premonitions are of immense importance. From the preceding, we see that all psychical phenomena can be simulated; this does not mean that every psychical phenomenon is simulated. Those who wish to explain away everything by fraud make as great a mistake, as those who trustingly accept everything without control.