The first and second weeks passed, the weather continuing fine. Many of the cattle ranged two and three miles north of the creek, not even coming in to water oftener than every other day. Several times the horsemen circled to the north; but as ranging wide was an advantage, the cattle were never disturbed. A light fall of soft snow even failed to bring the cattle into the valley. Christmas week was ushered in with a display of animal instinct. The through and wintered cattle had mixed and mingled, the latter fat and furred, forging to the front in ranging northward, and instinctively leading their brethren to shelter in advance of the first storm. Between the morning and evening patrol of a perfect day, the herd, of its own accord, drifted into the valley, the leaders rioting in a wild frolic. Their appearance hastened the patrol of the inner line by an hour, every nook and shelter, including the old corral, being filled with frolicsome cattle. The calves were engaging each other in mimic fights, while the older cattle were scarring every exposed bank, or matting their foreheads in clay and soft dirt. "What does it mean?" inquired Joel, hailing Sargent, when the line-riders met. "It means that we'll ride the outside line in the morning," came the reply. "There's a storm coming within twelve hours. At least, the herd say so." "What can we do?" "Leave that to the cattle. They'll not quit the valley unless driven out by a storm. The instinct that teaches them of the coming storm also teaches them how to meet it. They'll bed in the blue-stem to-night, or hunt a cosy nook under some cut-bank." A meeting point on the outer line, for the next morning, was agreed upon, when the horsemen separated for the evening. "Get out early, and keep your eyes open for any trace of cattle crossing the line," Sargent called back, as he reined homeward. "Dell and I will leave The Wagon at daybreak." The storm struck between midnight and morning. Dawn revealed an angry horizon, accompanied by a raw, blue-cold, cutting wind from the north. On leaving their quarters, both patrols caught the storm on an angle, edging in to follow the circle, their mounts snorting defiance and warming to the work in resisting the bitter morning. The light advanced slowly, a sifting frost filled the air, obscuring the valley, and not until the slope to the south was reached was the situation known. No cattle were in sight or adrift. Within an hour after leaving the line-camp, the experienced eye of Sargent detected a scattering trace where an unknown number of cattle had crossed the line. Both he and Dell dismounted, and after studying the trail, its approach and departure, the range-bred man was able to give a perfect summary of the situation.