"What do they do when they run out of captives?" he asked. "Catch Ogrum, feed him to beast," the dawn man answered. When they ran out of captives, the Ogrum sacrificed their own people! "Well, we've still got to find out what is in that temple and where our people are being held," Craig said grimly. "If Guru is afraid, Guru may stay here. I will go alone." Guru was afraid. There was no doubt about that. Craig did not criticize the dawn man for being afraid. He regarded it as evidence of good, sound sense. But, afraid or not, Guru went with him. Slipping like a pair of ghosts through the rough paths that served as streets, they entered the silent city. Guru was as noiseless as a shadow, and Craig, every sense alert, moved as quietly as an Indian. The big American knew that from any of the huts an Ogrum might emerge at any moment. * * * * * They reached the temple unobserved. It was a bigger building than had been apparent from the mountain above. Unlike the huts, it was constructed of stone. Roughly circular in shape, a line of columns circled the outer edge. The construction was crude. The Ogrum either had not yet invented the arch or scorned to use it. Numerous holes big enough for a man to enter standing erect, but not much bigger, served as entrances. The holes were without doors, another invention the Ogrum apparently had not yet made, and Craig was again struck by the strangely warped development of this race that knew how to build airplanes and to use poison gas but still did not know how to build arches. Unlike the city, the temple was guarded. Yellow-robed, shaven-headed sentries paced around the building keeping inside the circles of the columns. "Friends of the bright beast that is always hungry," Guru called them. Craig decided they were priests, temple guards. He saw they were armed with spears and swords. In addition each guard carried a pouch of small, round objects that looked like grenades. "Are those things _grenades_?" Craig whispered. But Guru had never heard of grenades. He did not understand. Nor could Craig make him understand. Through the small dark holes that served as entrances to the temple occasional flashes of light could be seen. The light was dull, like the fitful glow from a campfire that has almost burned out. "What is that?" Craig asked. But Guru either did not know or, for some superstitious reason, refused to talk. "I'm going into that temple," Craig decided. "You stay here and wait for me." This time Guru did not insist on going along and Craig realized that the dawn man was desperately afraid of something within the temple. Craig, waiting until one of the pacing sentries had passed, darted into the nearest opening.