The position, which the experimenters are obliged to assume around the table when they are seated, has the consequence of almost completely hiding their feet. As soon as the lights are lowered, it is nearly impossible to exercise that mutual control which it is indispensable should be exercised. Now, when the hands rest a little forcibly on the table, it is very easy, especially with a light table, to glide the point of a shoe under one of the legs of the table and to raise it above the ground. This manœuvre is all the easier, as the swaying of the table from side to side permits one to effect the movement, without much fear of detection. Needless to say that hooks attached to the wrist, or specially contrived bracelets, also permit of raising and holding the table in the air. But it is easy to protect oneself against fraud of this nature. Let every one stand up and join hands in the centre of the table; the kind of fraud I indicate will then be impossible. I myself have often obtained fine levitations in this way, but unfortunately in obscurity. I will point out still another fraudulent process practised at times by professional mediums. It consists in the following manœuvre. The medium places himself at the narrow end of a table,—in preference a rectangular one—he promotes various oscillations, and when he has succeeded in raising the end opposite to him, he spreads out his legs in such a way as to exercise a strong hold over the feet of the table, between which he is sitting. Once this pressure is exercised, there is nothing more for the medium to do, in order to obtain a levitation, than to lean his hands heavily on the table. It is easy to understand how the table, maintained in position by the trickster’s knees, executes a rotatory movement around an axis the points of which are fixed by the pressure of the knees; consequently the table, becoming parallel with the ground, appears to be abnormally levitated. This simulation can be successfully realised, even when some one is seated on a chair on top of the table; under the pretence of offering a better condition of control, the medium takes the hands of the person on the table, and finds in him the point of support required to promote the rotation of the table around its axis. We should keep this kind of fraud before the mind’s eye when seeking to obtain levitations, especially if operating in obscurity, for then this trick is most easy of execution. Once again, I cannot too strongly warn experimenters against dark seances: they are absolutely worthless when paranormal phenomena are required. These ought to be obtained in full light; under such conditions the levitation of the table is a verifiable phenomenon. II. TELEKINESIS