When he did the slate writing at this sitting I felt someone’s presence, and, sure enough, when he took the slates away there was an almost imperceptible hesitation. In this fraction of a second the slates were switched through a _trap in the panel_ behind me. I had a mirror on a rubber elastic fastened to my vest and as I took my seat I pulled the elastic so I could sit on it. I managed to secure this mirror and keep it palmed in my hand, and with it saw the panel slide open, the arm extended with the duplicate slates, and the exchange made. S. S. Baldwin, an acknowledged expert in Spiritualistic and Telepathic tomfoolery, was bamboozled by a Dr. Fair, according to his own story which he told to me in December, 1920. He received a message on a slate held by himself under a table, and afterwards, at the suggestion of the Doctor, made a thorough examination of the table, the room, and everything in sight, but failed to discover a concealed door in the wainscot of the wall through which a man in black garments could find his way to space under a sofa and thence to the table, which was a rather large one, do the Spirit writing and then make his exit while Mr. Baldwin was fully occupied holding the slate under the table with his eyes fixed on space above it. One of the very best mediumistic tricks, and one that has made the reputation of more than one well-known medium, is done with a number of small slates and one large one. The size of the slates is immaterial but the large one should be three or four inches larger each way than the others. The manner of presentation differs somewhat with different performers but in general is as follows. When the sitters arrive the slates are piled near one corner of the table, the larger one at the bottom and eight or nine smaller ones on top of it. The medium stands at the end of the table nearest the slates and after a few casual remarks he picks up the top slate with his left hand, changes it to his right and passes it to the sitter to be examined and cleaned if desired. When he is quite satisfied the medium takes it back, glances at both sides, and then places it on the table directly in front of the sitter. This is repeated with the remaining small slates, which are not stacked up evenly but left in a haphazard pile. While the last small slate is being placed on the pile with the medium’s right hand he picks up the large slate with his left and rests it on top of the others, at the same time passing the sitter a pencil and asking him to write a few lines on it requesting the Spirits to favor him with a message and to sign his name to it. He is at liberty to examine this slate also and to write his message on either side.