The storm finally blew itself out. It left the prospectors heavy and stupid for want of sleep. Their burros had wandered away, or had been buried in the sand. Far as eye could reach the desert had marvelously changed; it was now a rippling sea of sand dunes. Away to the north rose the peak that was their only guiding mark. They headed toward it, carrying a shovel and part of their packs. At noon the peak vanished in the shimmering glare of the desert. The prospectors pushed on, guided by the sun. In every wash they tried for water. With the forked peach branch in his hands Warren always succeeded in locating water. They dug, but it lay too deep. At length, spent and sore, they fell and slept through that night and part of the next day. Then they succeeded in getting water, and quenched their thirst, and filled the canteens, and cooked a meal. The burning day found them in an interminably wide plain, where there was no shelter from the fierce sun. The men were exceedingly careful with their water, though there was absolute necessity of drinking a little every hour. Late in the afternoon they came to a canyon that they believed was the lower end of the one in which they had last found water. For hours they traveled toward its head, and, long after night had set, found what they sought. Yielding to exhaustion, they slept, and next day were loath to leave the waterhole. Cool night spurred them on with canteens full and renewed strength. Morning told Cameron that they had turned back miles into the desert, and it was desert new to him. The red sun, the increasing heat, and especially the variety and large size of the cactus plants warned Cameron that he had descended to a lower level. Mountain peaks loomed on all sides, some near, others distant; and one, a blue spur, splitting the glaring sky far to the north, Cameron thought he recognized as a landmark. The ascent toward it was heartbreaking, not in steepness, but in its league-and-league-long monotonous rise. Cameron knew there was only one hope--to make the water hold out and never stop to rest. Warren began to weaken. Often he had to halt. The burning white day passed, and likewise the night, with its white stars shining so pitilessly cold and bright. Cameron measured the water in his canteen by its weight. Evaporation by heat consumed as much as he drank. During one of the rests, when he had wetted his parched mouth and throat, he found opportunity to pour a little water from his canteen into Warren's.