height of this roof was not at first apparent until it was compared with the pigmy-like figures of the workmen who were busily engaged about a great, black, cigar-shaped object, which had the general appearance of a Zeppelin. In the dim light, there was nothing about its aspect to distinguish it from the latest models of the German air-ship, save that it seemed to be of heavier construction, as shown by the great difficulty with which the men were moving it toward the farther end of the shed, which was entirely open. "I would especially call your attention to the track upon which moves the cradle that carries the large black object in the centre of the picture," said Edestone. "The tires are made of hard rubber, and the rails which are of steel rest on glass plates attached to each of the tires. Thus, any object placed in the cradle becomes absolutely insulated, and has no electrical connection with the earth, which, as I have explained, are the requisite conditions to permit of 'Deionizing' by the use of an instrument similar to the one I have in my pocket. Of course, though in actual operation we use a much larger 'Deionizer' than the little model I have shown you, and run it with a hundred horse-power motor, instead of with a small spring and watchworks. This track and cradle at which you are looking, although they weigh many tons, can be easily taken apart and transported in sections, as I stand ready to demonstrate." The film ended as he finished, and for a moment the screen was blank; then with a little splutter from the cabinet, another picture appeared. This was of a great open space, the most desolate and lonely stretch of country that could well be imagined, a broad, open plain that stretched on for miles and miles, perfectly flat, treeless and uninhabited. The wind apparently was blowing violently, judging from the way it tossed Edestone's hair about as, hatless, he walked back and forth in the near foreground, shading his eyes from the sun with his hand while he looked into the lens and called his directions to the man who was working the camera. "That disreputable-looking individual is myself," he confessed. "My hat had blown away, a circumstance quite inconvenient at the time, but not without a certain element of present interest, as showing that a high wind was blowing at that time." Behind him in the middle distance was a track and cradle similar to the one shown in the first picture. The machine in the cabinet buzzed, and clicked, and made a noise like that of a small boy rattling a stick along a picket fence. A draught from some open window blowing against the linen screen caused the flat, deserted plain to undulate like the waves of the sea. The horizon bobbed up and down, showing first a great expanse of sky, and then the foreground ran up to infinity. The cradle was seen first at the right, and then at the left of the picture. The clouds in the sky kept jumping about, as if the