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a-violet, you know. My robots are built of specially alloyed metals which permit great freedom of molecular vibration. The insulating materials and even the glass of the camera lenses are possessed of the same property. Get it? I merely set up a wave motion in the atoms of the material that is in synchronism with the frequency of ultra-violet light, which is invisible to the human eye. All visible colors are absorbed, or more accurately, none are reflected excepting the ultra-violet. Perfect transparency is obtained since there is neither refraction nor diffraction of the visible colors. And there you are!" Eddie stared at the upper half of the robot and saw that it was changing color as Shelton tuned the transmitted wave. Then suddenly it was gone. The entire upper portion of the mechanism had vanished; had just snuffed out like the flame of a candle. He could see down into the tops of the thing's hollow legs. Shelton laughed at him as he stretched forth his hand and hesitatingly felt for the invisible mid-section and upper body. It was there all right, unyielding and cold, that metal body. But no trace of it was visible to the eye. He drew back his fingers as if they had touched a hot stove. The thing was positively uncanny. "Dad! Turn it off--please," Lina begged. "It's getting on my nerves. Please!" Obligingly, Shelton pulled the switch. "Now you'll see," he said to Eddie, "whether the same thing happens. Watch." * * * * * Mistily at first, the outlines of the monster's torso and arms came into view, semi-transparent but clouding rapidly to opacity. Then it glinted with the barely visible violet, a solid once more, rigid and motionless. It was a lifeless mechanism, for the source of its energy had been cut off. Eddie had an almost irresistible impulse to pinch himself. Then he gasped audibly, as did Shelton, for the thing snuffed out of sight again without warning, and the hum of its many motors resumed. There came a terrific clanking as it waved arms and tentacles and violently threshed with its upper body. But the visible portion, its legs, remained rooted to the floor of the laboratory. Lucky it was that the scientist had disconnected those wires; lucky too that the machine guns were empty of ammunition. "There now--see?" Shelton's voice rose excitedly. "It's been no fault of mine. The power is off but it moves--it moves. What on earth do you suppose--" Eddie's s
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