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Rh making a careful examination, ties them together with stout cord, in which condition they are placed in the cabinet. Writing is immediately heard, and when it ceases the slates are at once handed out to the performer, who on separating them finds the required message.

The secret lies in the fact that the medium is provided with two small wooden wedges; also an umbrella rib, to which at one end is fitted a minute piece of pencil. All he has to do, therefore, is to force the wedges between the slates on one side until sufficient space is provided for the insertion of the rib, when the writing of the message will be found an easy matter.

.—In this case the two slates, after examination, may be actually screwed together with iron bolts, but in spite of this precaution writing is obtained as before.

Under these circumstances the performer is provided with a piece of prepared chalk—not the conventional commodity as sold by every chemist, but prepared by coating a piece of steel, about the size of a pea, with chalk paste, which is then allowed to dry. The piece of chalk is placed between the two slates, which are then bolted together and put into the cabinet; when, under