It would be superfluous to rehearse here at length what Mr. Sellers has set before you much better than I can, the steps to the conclusion to which we all arrived: that the long messages were written beforehand. The difference between them and the short answers to questions asked at the séance, in the character of the handwriting, is too manifest and too obtrusively patent to be disregarded. In the long message from 'William Clark' on the slate which we have preserved and had photographed, 'Paul's injunction' is carefully included within quotation marks. The short answers to questions were scarcely legible, and at times could be deciphered only by help of the Medium himself. (This illegible handwriting is not without its use; it engrosses the attention of the sitters.) It follows, therefore, that, if prepared slates are to be used, they must be adroitly substituted for others, which the sitters know to be clean. The question is thus narrowed to one of pure legerdemain, and the Medium must necessarily have several slates at hand. When two slates only are used, the prepared slate is usually lying on the table when the sitters take their seats. No attention is called to it, and some little time is taken in conversation, and in the spasmodic jerking caused by 'electric currents'; in a few minutes the slate pencil is placed on the slate; no offer is made of showing both sides, which would be quite needless, since the side which is exposed is perfectly clean, and it is on that side which the Spirits are expected to write; the slate is kept almost constantly and wholly in full view and but very slightly inserted beneath the table. After an interval of waiting, during which, by constantly looking at the slate as though impatient for the writing to begin, whereby his sitters become accustomed to the appearance and disappearance of the slate, the Medium reaches for a second slate, ostentatiously washes both sides, lays it on the table, removes the pencil from the first slate to the second, and places over it the first slate with its prepared message, face downward, and the trick is done. The two slates are held for a minute under the table, and are then held to the ear or on the shoulder of the sitter on the Medium's right hand--never to any other sitter, since to do so would reveal the scratching of the Medium's finger-nail on the rim of the slate, whereby the writing of the pencil within the slates is counterfeited. I have distinctly, three or four times, watched the motion of the Medium's finger while thus scratching; as I sat facing the window the fingers which held the slate and made the fictitious writing were sharply outlined against the light. And here let me say that he who sits on the Medium's left hand, the side to which he turns almost his full back, has the best position for observation. He told me many times that he did not like to have three sitters, but much preferred only two;