the huddled bodies for an instant, while that which had been human flesh vanished in a bursting cloud of smoke; while the stones beneath turned to a seething pool of molten rock.... Then the rod moved slowly toward the frozen figure of Danny O'Rourke. Did the strange being sense that Danny had not been disbelieving like the rest? Danny could never know. He knew only that he stood rigid with horror, entirely unable to move, while that rod swung upon him; he knew that the hand that held it released something that clicked, wherefore his life had been spared; and he knew that the savage face above wrinkled into something resembling a snarling, triumphant smile, as the rod was returned to its hiding place under the garment of shimmering blue, and the mysterious figure turned and strode savagely down the Avenue Stalin in the city of Stobolsk. Danny O'Rourke was to carry that picture clearly in his mind—the figure that moved unhurriedly on, towering above the others, men and women, who scurried fearfully from his path. But he was to retain yet more vividly the recollection of a group of red-clad bodies that were severed at their waists as a slim tube swung—then a bursting cloud of oily smoke, and a pool of molten rock where they had been. Something of this, perhaps, was clouding the eyes of Danny O'Rourke, Pilot of the A.F.F. a month and more later, as he sat at lookout duty in a gleaming white tower on a high peak of the Sierras. Not that the job of lookout was part of O'Rourke's duty, now that he was back in the U. S. A., but a cylinder of scarlet rested on a great rack at the base of the tower, and Danny had no wish to hear the roar of that cylinder's stern exhaust for a time. S Even the novelty of flying the newest rocket-ship in the service had worn off. Besides, he had patrolled his route, and he told himself that the "Infant" needed a rest. The "Infant," better known on the records of the A. F. F. as Morgan, David E., Lookout, Station 39-G, was sleeping soundly on the elevating table where a map of the district was mounted under glass. His cherubic face was pink and white, more suggestive of the age of three than of twenty-three. And O'Rourke, glancing at him protectingly, hung up a paper to keep the sunlight from striking the young man's face. The Infant had been Danny's special charge from the day he entered the service, and now, except for the Chief and some other officials, only Danny knew that the Infant was there