HE LAY BACK, PROPPED on an elbow. It was evident that he could do nothing about the buried boulder. If he was going to do anything, his problem was the tree. To move the tree, he would need a lever and he had a good, stout lever in his rifle. It would be a shame, he thought a little wryly, to use a gun for such a purpose, but he had no choice. He worked for an hour and it was no good. Even with the rifle as a pry, he could not budge the tree. He lay back, defeated, breathing hard, wringing wet with perspiration. He grimaced at the sky. All right, Cytha, he thought, you won out in the end. But it took a skun to do it. With all your tricks, you couldn’t do the job until.... Then he remembered. He sat up hurriedly. “Cytha!” he called. The Cytha had fallen into a hole that had opened