There are numerous other devices, such as trick bolts, which are inserted by a spectator through a post and screwed up tight, the medium being fastened to the bolt. He has simply to give the bolt a half twist, usually toward the right, and the bolt comes apart. The joint is invisible to the eye, and, in fact, is made more so just before it is used each time by being rubbed with sandpaper, which slightly roughens the bolt, making the joint imperceptible to the naked eye. There are staples, ordinary looking staple-plates, which are apparently screwed fast into the bench on which the medium is seated. The hands of the medium are fastened to the staples by wire. The staples are not fastened to the plates by riveting them, as is ordinarily done, but are held by a spring catch, concealed under the plate, and working in a notch in the staple. This is released by the medium’s pushing the catch back by the insertion of a piece of clock spring between the staple plate and the bench. After releasing himself he performs the stereotyped manifestations, and at the finish has simply to jam the staples back into their plate, whereupon they are locked or held fast by the spring catch or bolt. This was a device used by a Boston medium. There are also trick bags in which the medium is bound up or tied. In one style of bag there is a string running in the selvage, or turned-over portion of the bag at the top. As the string is about to be drawn taut the medium inserts one of his fingers into a portion of this selvage not sewn, and pulls down enough slack of the cord to allow him, after the tying, either to place his arm through or to get out entirely. Another style is this: The medium has a round wooden plug, covered with cloth like the bag. This he has concealed about him. As the mouth of the bag is gathered together to tie the string, the medium inserts this plug, and bag and plug are both tied. After the tying he has simply to remove the plug and he can then place his hand through and release the cord, or shove it off the bag completely. Still another way is to have a duplicate bag concealed down one trousers leg and coming up at the back of the neck under the coat, the mouth of the bag being upward. When the medium gets in, his manager or the director of the séance gathers the mouth of the bag together, and, at the same time, pulls the duplicate bag out from under the medium’s coat. He pulls this up four or five inches higher than the original bag and ties his handkerchief around where the two bags are joined, so the trick will not be detected. He then allows a committee to tie, and even sew, the bag together--of course, the duplicate, not the first one. The medium has simply to pull the first bag down around him, get out of it and conceal it on his body. A “dodge” used sometimes is to borrow one of the investigators’ handkerchiefs and drop it into the duplicate bag; and, after the medium has escaped and the