Savagely John Cortland kicked at his chair as he paced across the room. There was one slender hope, a tiny thread that might save them at last. Europe was prostrated, Asia in turmoil, and America in chaos. All depended on the theory that the origin of the destructive vibration that had set their ozone molecules into their dance of death had intelligence back of it. The source of the radiation could not be found at this time, but that was not needed. If they could use the incoming radiation field as a carrier and heterodyne on it a super-imposed vibration perhaps the source could be destroyed. 

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