The four cries were so distinct, so equal in length, and repeated at such regular intervals that they seemed to Francisco Alvarez like set notes. He listened intently, but they did not come again. He glanced at the prisoner but Paul had not stirred, the moon's rays illuminating his face with a pale light. The renegade, too, slept soundly. Alvarez wrapped himself in his blanket after the fashion of the others, and lay down, but still sleep would not come. He knew that it was far in the night and he wished to be rested and fresh for the next day, but he lay awake, nevertheless. A half hour passed, and then came that plaintive cry of the wolf again. As before, it seemed to be wonderfully distinct and full of character, but it was nearer now. Francisco Alvarez raised himself on his elbow, and heard it a second and then a third and fourth time. After that only the heavy silence of the forest. "The same as before," murmured the Spaniard to himself. "The wolf howled four times. What a coincidence! Bah, I'm becoming a superstitious fool!" He resolutely closed his eyes and sought slumber once more. It was far past midnight now, and weary nature began at last her task. His nerves were soothed. A soft breeze fanned his eyelids with drowsy wing, the forest wavered, swam away, and he slept. Red dawn was coming when Francisco Alvarez awoke. The fire was dead and cold, and the men around it yet slumbered. The two sentinels, one to the right and one to the left, still sat on the logs, backs toward him. He took one glance to see if the prisoner, too, slept, and then he leaped to his feet with a cry. The prisoner was not there! Nor was he anywhere in the camp. "Up! up! you rascals!" shouted the Spaniard. "The boy is gone! escaped. Luiz, Pedro, in what manner have you watched!" He rushed to the sentinel on the right, Luiz, and struck him sharply across the back with the flat of his sword. "Wretch!" he cried, "you have slept!" and he struck him again. Luiz did not stir, even under the sharp blow. He remained, sitting on the log, back to his chief, shoulders bent forward, as if he were in a slumber too profound to be disturbed by anything short of a crash of thunder in his ear. Alvarez, furious with anger, seized him by the shoulder and dragged him back. Then he uttered another cry, in which rage and surprise were mingled in equal portions. But Luiz, the sentinel, still said nothing. He could not. A gag was fixed firmly in his mouth, his arms were bound to his side, his legs to the tree on which he sat, and his rifle had been left standing between his knees and against his shoulder, as if held by one who watched.