let the experimenter grasp this bared arm, near the wrist, with the
third and fourth fingers of his left hand, closing them around it
tightly, and as he does so, asking the owner of the arm to note that
this is his left hand, then let the experimenter, without relaxing this
hold, stretch the remaining fingers and thumb up the arm as far as he
can, and while clasping it with his thumb and forefinger, remark that
this second pressure comes from his other hand. The conviction is
complete in the mind of the blindfolded friend that he feels the grasp
of two hands, whereas only the left hand of the experimenter has grasped
his arm, and the right hand is free to beat a drum or play a zither.
After this test, which is patent to all, we can dismiss the theory of a
Spiritual origin of the hand behind Mr. Keeler's screen. To forestall
the discovery by Mr. Keeler's companion of this trick, and to prevent
its detection by simply feeling with his free right hand after the
suppositious hands of the Medium, which are grasping his left forearm,
a second visitor is requested to share the discomfort of the muslin
envelope, and to sit on the right of the first visitor and to hold the
latter's truant right hand with his left hand, while his right is
exposed to view outside the curtain. Again we refer to the Appendix for
the minutes of our meeting.

We had a séance also with Messrs. Rothermel and Powell, of whom the
former is the Medium, the latter, acting mainly as a reservoir of
psychic force, guides and directs the séance. In this case the Medium's
Spiritual manifestations, as well as his material arrangements, are
similar to those of Mr. Keeler, except that instead of having a visitor
whose arm may be grasped, Mr. Rothermel's hands are fastened in his lap
by bands of tape passed around his legs and sewed to his clothes. After
the black curtain had hid the hands from our sight we were not again
allowed to examine them except in the most hurried and superficial way,