He had now been out for two nights, and was now well along on the second day. During all that time he had not had a mouthful to eat. His lips were dry and parched; his throat burned fearfully. Still, he kept resolutely on. About two o'clock in the afternoon the herd came upon a clump of trees. Tad at sight of it, spurred his pony on, attracted by the greenness of the grass about the place, hoping that he might find a spring. But he was doomed to disappointment. There was no sign of water to be found. With almost a sob in his throat the boy swung himself into his saddle again. "Barney, you and I ought to be camels. Then we could carry all the water we need," he told the pony. "If we don't find some pretty soon I reckon we'll dry up and blow away. Gid-ap, Barney!" Once more the lad began his monotonous pounding back and forth along the side of the herd which was now spread out over a full half mile of territory, urging with all his strength in order to get the animals to quicken their pace. In the camp, Stallings and the others had begun to show their worriment. Not a trace had been found of boy or herd. The main hope of the foreman was that Tad might come upon a ranch or a town somewhere, in his course, and in that way get help to direct him back to camp. As for the cattle, he feared that they had become so split up that it would be well-nigh impossible to get them together again. During the whole afternoon, Bob Stallings had been riding about his own herd, sweeping the plain with a pair of field glasses. A speck of dust far to the northwest suddenly attracted his attention. Stallings halted his pony, and, sitting in his saddle almost motionless, gazed intently at the tiny point that had come within range of his vision. "I wonder what that is," mused the foreman. "It can't be any of our party, for they would not be likely to be away off there--that is, unless they have rounded up the bunch." Stallings, after a while, wheeled his pony and dashed back to camp. "If any of the men come in, tell them to head northwest and come on as fast as they can." "Do you see anything?" asked the Professor anxiously. "I don't know. I hope I do," answered the foreman, leaping into his saddle and putting spurs to his mount. "It may be some other herd crossing the state," he muttered, keeping his eyes fixed on the speck that was slowly developing into a miniature cloud. The foreman urged his pony to its best pace, and, in the course of half an hour he was able to make out a herd of cattle. That was all he could tell about it. However, it was not long before he discovered a lone horseman working up and down the herd. Stallings was in too great a hurry to use his glasses now. He was driving his pony straight at the yellow mark off there on the plain, without swerving or appearing to exert any pressure at all on the bridle rein. "It's the Pinto, as I'm alive!" he breathed.