leaving enough leeway for evasive action in the event the craft was caught by a downdraft. It was hard work and you couldn't relax for a minute. The storm had passed quickly, but the crystal-clear air was deceptive. The only difference so far as Macready was concerned was that when there was no blowing snow or ice you could have the pleasure of seeing where you were most likely to crash. Palmer occupied the copilot's seat while Norris peered over their shoulders from behind. The geophysicist was pointing at the plastic map taped to the flight console. "One of their sites should be directly over here. The one we're after is a few hundred yards farther south." "I know." Macready leaned on the controls and the copter heeled over to starboard. A high, even-topped white wall loomed directly ahead. Norris regarded it professionally. The symmetry of the formation hinted that more than normal mountain-building activity might be responsible for its formation. The wall might mark the location of a minor fault line, or a lava tunnel. Or there might not be any stone present at all if it was a fossil pressure ridge of pure ice. The copter rose and they soared over the wall. On the other side a flat glacial plain stretched toward distant high mountains. Instantly visible as soon as they cleared the ridge and marking the center of the white plain like a giant ink spot was an enormous blackened crater. The lab was full of dead dogs. They lay in a macabre row, each carefully tagged on one leg. Clark had eventually recovered his senses sufficiently to assist in the unpleasant work, but the pain finally became too much for him and he had to flee the room. Each of the dead animals had a name, each had been a close friend. Fuchs was preparing new slides, which Blair studied under the microscope. Two cells were visible through the eyepiece. They were active, neither quiescent nor dead. One looked quite normal. Its companion looked anything but. At the moment the two were joined together by a thin stream of protoplasm. Material from the larger cell, which was long and thin, flowed into the smaller, spherical cell. As it did so the smaller cell swelled visibly, until the cell wall fractured in three places. Immediately the smaller cell assumed a flattened shape like the other and three new streams of material began to flow outward from its interior. Neither cell appeared to have lost any mass. Blair pulled away from the eyepiece and frowned as he checked his watch. It was running in stopwatch mode. He turned it off. The resulting readout was very puzzling. Macready bounced the copter a couple of times as he set it down, but neither ship nor passengers showed ill effects. The steady hum of the rotors slowed to a stop. He pulled down his snow goggles and stepped out onto the ice. Norris and Palmer were right behind him It was a short walk to the fringe of the crater. Macready paused to kick aside a gnarled chunk of gray metal. The impact reduced it to splintery fragments. Another piece was so big they had to walk around it. The massive hole was more than fifteen feet deep. Considerably more. The bottom of the crater was lined with charred, blackened metal. Everything was gray or black. The metal fragments were lusterless, dull as antimony but smooth all the same. Macready didn't know what to make of a polished surface that was nonreflective. The ice around the rim was as smooth as glass and only recently rouged over with freshly blown snow. What hadn't been blasted away or vaporized had melted. The outline of the hole suggested that it had contained a large sphere. Macready met Norris's eyes and said nothing. Only Palmer made no pretense of concealing his awe. "Wow. Whatever it was, it was big ." "Look at this." Macready moved to his left and picked something off the ice. His companions gathered around. "Recognize it?" he asked them. Palmer shook his head, but Norris nodded quickly. "Looks like the remains of a medium-charge