Despite his determination to get an ugly task over and done with, he was a full four hours making the first ten miles. He walked as swiftly as he might to take the full advantage of the lesser heat of the earlier hours, but his way led him through loose sand, down into cuts and gorges, up their steep sides, across fields of loose stones, which, shifting underfoot, made his striving for haste a pure work of Tantalus. At the end of the first hour the heat was already intense; at the end of the second he felt that his skin was as dry as the desert sands and that the moisture of his body was being sucked out of it by the thirsty air and that at every stride the day grew drier and hotter. Thirst clutched his throat, ached throughout his body, that thirst which is like no other, desert thirst. Again and again he drank from his canteen. When he ploughed up the slope of the little hills and then down into their hollow to the double-ringed spring, his canteen was half empty. And when at last he came to the spring itself he found it as dry as a last year's seedpod. Until this instant the day's adventure had been merely the acme of unpleasantness. Now something more sinister entered into it. He made certain that he had found the place where the water-hole should be. Then he sat down. His eyes were very grave. 'If I don't play this hand right,' he told himself solemnly, 'I'll never get out of this.' He found a few breast-high bushes and crawled into their thin shade and lay down; before him he spread out the Quigley storekeeper's map. This he studied with thoughtful eyes. The storekeeper had said it would be no trick at all for a man like Howard to make the trip, but he had meant Howard on horseback. On foot it became quite another matter. The next spot where he should find water was some twenty miles ahead of him; at the rate he had travelled this morning it would take him some eight hours to come to it. Further, at the rate he had drank from his canteen this morning, that canteen would be empty when he had gone half the distance. Clearly, he must drink less water, just half what he had drank during the last four hours. Clearly also, it would grow hotter and he would want more instead of less water. Clearly again--and here was the point of points--when he came to the twenty-mile-distant water-hole, it too might be dry. And, after that, there was not another spring for another twelve or fifteen miles. Yes, many things were clear.