And now as to the rest of the phenomena witnessed that evening in C--'s room. The raps on the table top were the result of an ingenious, hidden mechanism, worked by electricity; the mysterious hand that operated under the table was the juggler's right foot. He wore slippers and had the toe part of one stocking cut away. By dropping the slipper from his foot he was enabled to pull the edge of my coat, lift and shove a chair away, and perform sundry other ghostly evolutions, thanks to a well trained big toe. Dr. Slade who was long and lithe of limb, worked this dodge to perfection, prior to the paralytic attack which partly disabled his lower limbs. The stringed instrument which played in the cabinet was arranged as follows: Inside of the guitar was a small musical box, so arranged that the steel vibrating tongues of the box came in contact with a small piece of writing paper. When the box was set to going by means of an electric current, it closely imitated the twanging of a guitar, just as a sheet of music when laid on the strings of a piano simulates a banjo. This spirit guitar is a very useful instrument in the hands of a medium. It may be made to play when it is attached to a telescopic rod, and waved in phosphorescent curves over the heads of a circle of believers in the dark séance. I shall now sum up the subject of Dr. Slade's spirit-slate writing, (Fig. 3) and endeavor to show how grossly exaggerated the reports of the medium's performances have been, and the reasons for such misstatements. No one who is not a professional or amateur prestidigitateur can correctly report what he sees at a spiritualistic séance. It is not so much the swiftness of the hand that counts in conjuring but the ability to force the attention of the spectators in different directions away from the crucial point of the trick. The really important part of the test, then, is hidden from the audience, who imagine they have seen all when they have not. Says Dr. Max Dessoir: "It must therefore be regarded as a piece of rare naiveté if a reporter asserts that in the description of his subjective conclusions he is giving the exact objective processes." This will be seen in Mr. Davey's experiments. Mr. Davey, a member of the London Society for Psychical Research, and an amateur magician who possessed great dexterity in the slate-writing business, gave a series of exhibitions before a number of persons, but did not inform them that the results were due to prestidigitation. No entrance fee was charged for the séances, but the sitters, who were fully impressed with the genuineness of the affair, were requested to submit written reports of what they had seen. These letters, published in vol. iv of the Proceedings of the Society, are admirable examples of mal-observation, for no one detected Mr. Davey exchanging slates and doing the writing.