Slowly day advanced. The east resolved itself from flaming red into the neutral tint of the remainder of the sky. The sun shone through the clouds, dissipated them, was obscured, and shone again. The something which the man had been watching so intently gradually grew clearer. It was the trail of another horse--a galloping horse. It was easy to follow, and the rider looked about him. After a few miles, when the mustang had warmed to his second wind, a gauntleted hand dropped to the yellow neck and stroked it gently. "Let 'em out a bit, Buck," said a voice, "let 'em out!" and with a flick of the dainty ears, almost as if he understood, the little beast fell into the steady swinging lope which was his natural gait, and which he could follow if need be without a break from sun to sun. On they went, the trail they were following unwinding like a great tape steadily before them, the crunch of the frozen snow in their ears, tiny particles of it flying to the side and behind like spray. But, bravely as they were going, the horse ahead which had unwound that band of tracks had moved more swiftly. Not within inches did the best efforts of the buckskin approach those giant strides. It had been a desperate rider who had urged such a pace; and the grim face of the tall youth grew grimmer at the thought. Not another sound than of their own making did they hear. Not an object uncovered of white did they see, until, thirteen miles out, they passed near the deserted Baker ranch; but the trail did not stop, nor did they, and ere long it faded again from view. The course was dipping well to the north now, and Ben realized that not again on his journey would he pass in sight of a human habitation. All that mortal day the buckskin pounded monotonously ahead. The sun rose to the meridian, gazed warmly down upon them, softened the surface of the frozen snow until the crunch sounded mellower, and slowly descended to their left. The dainty ears of the pony, as the day waned, flattened close to his head. Foam gathered beneath the saddle and between the animal's legs; but doggedly relentless as his rider, he forged ahead. Much in common had these two beings; more closely than ever was their comradery cemented that day. Many times, with the same motion as at first, the man had leaned over and patted that muscular neck, dark and soiled now with perspiration. "Good old Buck," he said as to a fellow, "good old Buck!" and each time the set ears had flicked intelligently in response.