That last picture was the most vivid, and when he realized he had actually stopped his car, it was a moment before it would go away. Then he saw he was parked in front of a demolished old apartment building a few blocks from his home. Only yesterday he'd watched the last wall going down. Now, just across the littered sidewalk from him, the old cellar gaped, flimsily guarded in front by a makeshift rail and surrounded on the other three sides by great hillocks of battered bricks. Tomorrow probably (and in fact that was the way it happened) a bulldozer would tumble them forward, filling the cellar with old bricks and brick-dust, leveling the lot. * * * * * Now he knew what he was going to do. He unlatched the top over the windshield and pushed the button. Slowly the top folded back over his head, showing the smoke-dark sky, almost night. He hitched up a little in the seat, reached inside his coat, pulled out the blue box he always carried and pitched it into the dark pit across the sidewalk. He was driving away almost before it landed. Yet through the hum of the motor he thought he heard something call faintly, "Good-by." The material of the filled-in cellar stayed fairly dry for many years and the atom-bombing, when it finally came, created a partial surface-seal of fused stone over that area. However, the bicarb box fell apart in time; water reached it in little seepings and was accumulated as a non-evaporating fuel-and-oxydizer mix. The amount of this strange fluid grew and grew, eventually invading and filling a now-blind section of the city's old sewer system. Many tens of thousands of years after that, the buried pool was sensed by the fuel-finders of a spaceship from up Polaris way, which had made an emergency landing on the ruined planet. A well was drilled and the mix pumped up and the centipedal Polarians, scuttling about the bleak landscape, had a fine time trying to explain how such a sophisticated fluid should occur in a seeming state of nature. However, they were grateful to the Cosmic All-Father. Long before that, Ernie had arrived home in something of a daze. He told himself that he had cast off the most tangible element of his "insanity," but he didn't feel any the better for it. In fact, he felt distinctly apathetic when his sister confronted him and only with an effort did he manage to brace himself for the trial he knew she had in store for him. "Ernie," she said hesitatingly, "I've come to a decision about something--about a change in our arrangements here, to tell you the truth--and I've gone ahead with it without consulting you. I do hope you won't mind." "No," he said heavily, "I guess I won't mind." "I'm doing it partly on Mr. Jones's advice," she added slowly. "As a matter of fact he suggested it." Ernie nodded. "Yes, I've noticed the two of you conferring together." "You have? Then maybe you know what I'm talking about."