At first Cameron had curbed his restless activity to accommodate the pace of his elder comrade. But now he felt that he was losing something of his instinctive and passionate zeal to get out of the desert. The thought of water came to occupy his mind. He began to imagine that his last little store of water did not appreciably diminish. He knew he was not quite right in his mind regarding water; nevertheless, he felt this to be more of fact than fancy, and he began to ponder. When next they rested he pretended to be in a kind of stupor; but he covertly watched Warren. The man appeared far gone, yet he had cunning. He cautiously took up Cameron's canteen and poured water into it from his own. This troubled Cameron. The old irritation at not being able to thwart Warren returned to him. Cameron reflected, and concluded that he had been unwise not to expect this very thing. Then, as his comrade dropped into weary rest, he lifted both canteens. If there were any water in Warren's, it was only very little. Both men had been enduring the terrible desert thirst, concealing it, each giving his water to the other, and the sacrifice had been useless. Instead of ministering to the parched throats of one or both, the water had evaporated. When Cameron made sure of this, he took one more drink, the last, and poured the little water left into Warren's canteen. He threw his own away. Soon afterward Warren discovered the loss. "Where's your canteen?" he asked. "The heat was getting my water, so I drank what was left." "My son!" said Warren. The day opened for them in a red and green hell of rock and cactus. Like a flame the sun scorched and peeled their faces. Warren went blind from the glare, and Cameron had to lead him. At last Warren plunged down, exhausted, in the shade of a ledge. Cameron rested and waited, hopeless, with hot, weary eyes gazing down from the height where he sat. The ledge was the top step of a ragged gigantic stairway. Below stretched a sad, austere, and lonely valley. A dim, wide streak, lighter than the bordering gray, wound down the valley floor. Once a river had flowed there, leaving only a forlorn trace down the winding floor of this forlorn valley.