The jeep swerved toward the tower and pulled up underneath it in a swirl of dust that settled slowly and evenly in the low gravity of the airless satellite. Kiffer jumped out of the jeep, grabbed the rungs of the ladder, and lifted himself to the platform at the top of the twenty-foot tower. He stuck his head up over the edge and saw Roysland. The man was sitting on a small chair with his back to the ladder. Surrounding him were the various recording instruments that had been rigged up on the platform for testing the animals and the effects of the beam on them. Kiffer climbed on up and twisted his helmet phone control to Roysland's frequency. As he put his hand on Roysland's shoulder, he said: "Stand up, Roysland." Roysland jerked around. "What? Oh. Hi, Kiffer; I saw you coming in the jeep." He paused then, and though Kiffer couldn't see very well through the heavy darkness of the helmet's glare-filtering polarization, he could have sworn that Roysland was grinning. He would have been right. "Oh, I get it," Roysland said. "You were expecting to find me sitting up here with a feedback lobotomy. Frankly, so was I, a half hour or so ago, but I'd almost forgotten it." Kiffer took a deep breath, let it out, and said a few choice, pungent words. "... Who would scare a guy like that," he ended. "Sorry," Roysland said, still grinning. "But take a look at these readings. I think you'll--" "Wait a minute!" Kiffer interrupted. "I'm not interested in meter readings right now! What happened or didn't happen to you?" "_Is he all right?_" "_What's going on up there?_" "_Need any help?_" The voices came almost simultaneously to Kiffer's phones. He could see the second jeep tearing up dust between the gun emplacement and the target tower. "He's O.K.," Kiffer snapped. "Big false alarm! I think we ought to have an explanation." The answering burst of catcalling and jeers made Roysland wince. "O.K., fellers! O.K.! Please accept my abject and snivelling apologies." "Explain yourself," Kiffer said in a monarchial tone. "You were supposed to be out here testing this thing on yourself; you wrote a very heart-rending note to that effect. I don't blame you for getting cold feet, but you could at least have notified us." "I didn't get cold feet," Roysland said. "Look at the cerebrograph reading and compare it with the firing record." Kiffer looked and then said: "Then you _did_ take it! But according to this, all it did was cause a very faint _petit mal_ convulsion. You probably didn't even notice it." "I didn't," Roysland said. "I don't know what that projector is supposed to do, but it sure isn't a mindjammer!" Kiffer looked again at the records. "Maybe you weren't far enough away from the projector," he said doubtfully. "Maybe the distance--" "Impossible," said Roysland. "The beam doesn't disperse appreciably over a distance of half a light-year; you know that. And the wave form is exactly the same.