"These are the Milbuns, sir. Mr. Milbun is a merchant at present. Quite well-to-do, I understand. Mrs. Milbun is a housewife right now. The daughter, Mavis, is with a midtown firm at the moment. The mother became ill at an awkward time. The family put their vacation off for her, and as a result their charge has run very low. If you can get to their apartment without being--ah--swept, I feel sure they will welcome you, sir." He scribbled a rough map on a piece of paper, drew an arrow and wrote "6140 Runfast Boulevard, Apartment 6B," and stamped the paper "Courtesy of Save-Your-Life Co." Then he wished Dan a healthy vacation and walked with him to hold open the outer door. Dan thanked him and went outside, where the crowd was now almost blocking the sidewalk. He forced his way free, saw someone point, and glanced at the statue. The wrench in the statue's left hand had been replaced by what looked like a magnifying glass. Dan had gone a few steps when there was a thundering cheer, then a terrified scream high in the air behind him. He turned around and saw a man come plummeting down. Dan gaped higher and saw a line of tiny figures going across high up on the rope. One of the figures slipped. There was another cheer. Dan hurriedly turned away. He had already convinced himself that the Porcyns had a "proper mercantile attitude." And he thought he was beginning to get an idea as to how they kept their population down. IV Carefully avoiding brass plates, Dan made his way along an avenue of shops devoted to exercise and physical fitness. He came to Runfast Blvd. and located 6140, which looked like the apartment houses he had seen earlier. He tried the outer door; it was locked. When someone came out, Dan caught the door and stepped in. As the door shut, he tried it and found it was locked again. He stood for a moment trying to understand it, but his sleeplessness of the night before was catching up with him. He gave up and went inside. There were no elevators on the ground floor. Dan had his choice of six ropes, two ladders and a circular staircase. He went up the staircase to the third floor, where he saw a single elevator. He rode it up to the sixth, got off and found that there was a bank of four elevators on this floor. He looked at the elevators a minute, felt himself getting dizzy, and walked off to locate apartment 6B. A powerfully built gray-haired man of middle height answered his knock. Dan introduced himself and explained why he had come. Mr. Milbun beamed and his right hand shot forward. Dan felt like a man with his hand caught in an airlock. "Lerna!" called Milbun. "Lerna! Mavis! We have a guest for vacation!" Dan became aware of a rhythmical clinking somewhere in the back of the apartment. Then a big, strong-looking woman, obviously fresh from the kitchen, hurried in, smiling. If she had been ill, she was clearly recovered now.