Here is another slate writing secret. Dissolve in hydrochloric acid some small pieces of pure zinc, about one-half ounce to an ounce of acid. With this solution write upon the slate with a quill or a small camel’s hair brush the desired communication. When dry it closely resembles writing done with a slate pencil. When the time arrives for the test, wash the slate, and it appears to be perfectly clean; allow any one to examine it and hold it until it becomes dry, but with the prepared side down. On the slate being turned over it is found to be covered with writing while in the spectator’s hand. Here is still another idea. The medium has a number of slates in his arms, say four. He hands the investigator the top one to clean. When he has done so, the medium receives it back and places it at the bottom of the pile of slates and hands him another again from the top to be cleaned, and repeats this operation until all four slates have been cleaned. He now takes two of the slates, places them together, and, on removing them again, writing is found on one of them. Here is the method of procedure: Prepare your communication on one of the slates, and let it be the bottom of the pile, with the writing side down. Have your visitor seated, stand by his side just a trifle behind him, hand him the top slate to clean; after he has done so, hand him the second one and receive the first one back, placing it at the bottom of all the slates, and repeat until the third slate. While this one is being cleaned, slip the fourth, now the top slate, to the bottom again. When the third slate is received, place it on the bottom and hand the fourth, really the first one over again; it is, of course, the top one and dry by this time, and the investigator is none the wiser. Of course, the two slates placed together afterward are the one prepared with writing and one of the blank ones. Instead of slipping the top slate to the bottom, sometimes another dodge is used. The medium simply turns the three slates over by a twist of the hand. This brings the prepared slate at the bottom and the last slate cleaned at the top, and he says he will clean this one, thus saving time; really, however, to disguise the fact that it is still wet from the last cleaning. He says, however, to the visitor, “You can clean it also, if you desire.” CHAPTER IV. MIND READING AND KINDRED PHENOMENA.