Dr. Taylor, unfortunately, did not succeed in getting possession of the medium's prepared slate. Another exchange was undoubtedly made by Mr. Keeler, and the physician had returned to him his own marked slate. When he got home that afternoon, and had time to carefully scrutinize his slates, he found that they bore no evidence of having been written upon at all. Having also examined these slates, I am prepared to add my testimony to that of Dr. Taylor. The reader will see from the above-described séance that unless the medium (or a confederate) is enabled to read the names and questions, prepared by the sitter, his hands are practically tied in all experiments in psychology. When investigators bring their own marked slates with them, screwed tightly together, and sealed, the medium has to adopt different tactics from those employed in the tests before mentioned. He has to call in the aid of a confederate. The audacity of the sealed-slate test is without parallel in the annals of pretended mediumship. For an insight into the secrets of this phase of psychography, the reading public is indebted to a medium, the anonymous author of a remarkably interesting work, "Revelations of a Spirit Medium." Many skeptical investigators have been converted to Spiritualism by these tests. They invariably say to you when approached on the subject: "I took my own marked slates, carefully screwed together, to the medium, and had lengthy messages written upon them by spirit power. _These slates never left my hands for a second._" I will quote what the writer of "Revelations of a Spirit Medium" says on the subject: "No man ever received independent slate-writing between slates fastened together that he did not allow out of his hands a few seconds. Scores of persons will tell you that they _have_ received writing under those conditions through the mediumship of the writer; but the writer will tell you how he fooled them and how you can do so if you see fit. "In the first place you will rent a house with a cellar in connection. Cut a trap-door one foot square through the floor between the sills on which the floor is laid. Procure a fur floor mat with long hair. Cut a square out of the mat and tack it to the top of the trap door. Tack the mat fast to the floor, for some one may visit you who will want to raise it up. "Explain the presence of the fur by saying it is an absorbent of magnetic forces, through which you produce the writing. Over the rug place a heavy pine table about four feet square; and over the table a heavy cover that reaches the floor on all sides. Put your assistant in the cellar with a coal-oil stove, a tea-kettle of hot water, different colored letter wax and lead pencils, a screw driver, a pair of nippers, a pair of pliers, a pair of scissors and an assortment of wire brads. You are ready for business.