ten o'clock
He slept uneasily , waking from dreams of running water to toss for an hour before sleep came again . With the first streak of dawn he was up and on . Going was slow , for now the real torture of desert thirst was on him and he knew that unless he found water that day , buzzards would be circling over him on the morrow . By ten o'clock his tongue was swelling and he seemed to have ceased to sweat , and Peter leaned panting against the rocks in the shade of which Roger paused to rest . After a half hour , Roger rose to his feet . The morning had been breathless but as he rose , a little hot gust of air blew up from the canyon below . Instantly Peter raised his head and sniffed .