At length the boys who were to relieve them came out, and Jack and Joe raced their horses back to camp, caught up fresh horses, unsaddled those that they had been using, and presently sat down to breakfast. All the outfit had started to work, and Frank had his wagon packed, ready to roll as soon as these last two had finished breakfast. "McIntyre told me to tell you," he said, "that you two had better go along and help move the herd to the next camp. That's what you get for going on night herd--an easy job for the rest of the day." "That suits me well enough," laughed Joe. "We'll take it easy to-day, Jack, and I'll bet McIntyre will make it up to us in the next few days, and we'll have plenty of riding to do." "I hope we will," replied Jack. When they returned to the herd they found that the cattle had about finished feeding, and had been driven down to a little stream to drink. Now came the work of pushing them along over the ten or twelve miles to the next camp. It was a slow and more or less wearisome task; but, as Joe said, it was all in the day's work. The cattle were full and lazy and unwilling to move. Each one would go on just as long as it was being driven, but all the others stopped. It was constantly necessary to ride up behind the little groups and urge them on, and the time of two men was spent in riding backward and forward at the tail of the herd pushing on the laggards. One man rode ahead of the herd, at a slow walk; and there was one at either side, to keep the cattle from scattering. After the herd had been moving along for two or three hours, Bill Duncan, the man in the lead, called back something to the others; but they did not hear what he said, and, as he went on, paid no particular attention to it. A few moments later there was quite an excitement among the leading cattle. They were lowing and clustering together in a thick bunch, and as the cow punchers pushed up toward them they could see that they were pawing the ground and some of them were kneeling and thrusting their horns into the soil, and there was much commotion. Quietly, but very steadily the boys urged the cattle along and at length broke up the gathering; but the animals were excited, and the yearlings and young stock ran ahead, kicking their heels in the air and striking at each other with their horns. After they had passed the place, the explanation of the excitement was seen. Some animal had recently been killed there, and its blood and other remains smelled by the cattle had greatly excited them. "That must have been what Bill was talking about when he called back to us," Joe said to the others. "We ought to have sent some one up to find out what he was saying."