His pursuers were delayed by the dense flow of traffic. Their high-pitched cries faded as Dennison turned into a side street, ran down its length, then down another. He was in a section of massive apartment buildings. His lungs felt like a blast furnace and his left side seemed to be sewed together with red-hot wire. There was no help for it, he had to rest. It was then that the first bullet, fired from a silenced weapon, chipped a granite wall not three inches from his head. That was when Dennison realized the full extent of his carelessness. He pulled the bottle out of his pocket. He had hoped to carry out more experiments on the serum before trying it on human beings. Now there was no choice. Dennison yanked out the stopper and drained the contents. Immediately he was running again, as a second bullet scored the granite wall. The great blocks of apartments loomed endlessly ahead of him, silent and alien. There were no walkers upon the streets. There was only Dennison, running more slowly now past the immense, blank-faced apartments. A long black car came up behind him, its searchlight probing into doors and alleys. Was it the police? A long "That's him!" cried the shrill, unnerving voice of one of Dennison's pursuers. Dennison ducked into a narrow alley between buildings, raced down it and into the next street. There were two cars on that street, at either end of the block, their headlights shining toward each other, moving slowly to trap him in the middle. The alley gleamed with light now, from the first car's headlights shining down it. He was surrounded. Dennison raced to the nearest apartment building and yanked at the door. It was locked. The two cars were almost even with him. And, looking at them, Dennison remembered the unpleasant jog his memory had given him earlier. The two cars were hearses. The men in the subway, with their solemn faces, solemn clothing, subdued neckties, shrill, indignant voices—they had reminded him of undertakers. They had been undertakers! Of course! Of course! Oil companies might want to block the invention of a cheap new fuel which could put them out of business; steel