with two buttons placed in such a position as to allow the fingers when closed to press on one or other or both of them. My instructor said:—"No doubt you understand all about these lines of force, seeing that you are a friend of the Recorder. Well, if you press the top button on the left hand globe you will go to the left; and if you press the top button on the right hand ball you will go to the right, at the angles of the lines of force in whatever altitude you may be in. If you wish to steer a mid-course, then press both buttons in both balls equally, and you can deviate your course, more or less, from one side to the other by more or less pressing the buttons. Although this dungeon is not very high, you will be able to put my instructions to a practical test." He took the string he had previously fastened to my feet, and passing it through a bronze ring in the floor, secured it; then he went to my back and said, "I am now going to excite your girdle." I felt him moving some kind of a handle at my back, calling at the same time
