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.

It was nearing sunset when they came in sight of the hills bordering the river, and the last mile Ben drew the buckskin to a walk. The chain of hoof-tracks had changed much since the morning. The buckskin could equal the strides of the other now, and the follower was content. The evenings were very short at this season of the year, and they would not attempt to go farther to-night. At the margin of the stream Ben rode along until he found a spot where the full strength of the current ate into the bank. There on the thinner ice he hammered with the butt of his heavy rifle until he broke a hole; then, the dumb one first, the two friends drank their fill. After that, side by side, they walked back until in the shelter of a high knoll the man found a space of perhaps half an acre where the grass, thick and unpastured, was practically bare of snow. Here he removed saddle and bridle, and without lariat or hobble—for they knew each other now, these two—he turned the pony loose to graze. He himself, with the kit and blanket and a handful of dead wood, went to the hill-top, where he could see for miles around, built a tiny fire, an Indian's fire, made a can of strong black coffee, and ate of the jerked beef he had brought. Later, he cleared a spot the size of a man's grave, and with grass and the blanket built a shallow nest, in which he stretched himself, his elbow on the earth, his face in his hand, thinking, thinking.

The night came on. As the eastern sky had done in the morning, so now the west crimsoned gloriously, became the color of blood, then gradually shaded back until it was neutral again, and the stars from a few scattering dots increased in numbers and filled the dome as scattered sand-grains cover a floor. Darkness came, and with it the slight wind of the day died down until the air was perfectly still. The cold, which had retreated for a time, returned, augmented. As though it were a live thing moving about, its coming could be heard in the almost indistinguishable crackling of the snow-crust. As beneath a crushing weight, the ice of the great river boomed and crackled from its touch.

Wide-eyed but impassive, the man watched and listened. Scarcely a muscle of his body moved. Not once, as the hours slipped by, did he drowse; not for an instant was he off his guard. With the first trace of morning in the east, he was astir. As on the night before, he made his Indian's fire, ate his handful of beef, and drank of the strong black coffee. The pony, sleepy as a child, was aroused and saddled. The ice which had frozen during the night over their drinking-hole was broken. Then, both man and horse stiff and sore from the exposure and the previous exertion, the trail was taken up anew.

For five miles, until both were warmed to their work, the man and beast trotted along side by side. "Now, Buck, old boy!" said Ben, and mounting, they were off in earnest. At first the trail they were following was that of a horse that walked; but later it stretched out into the old long-strided gallop, and the pursuer read the tale of quirt and spur which had forced the change.

Three hours out, thirty odd miles from the river as the rider calculated the distance, he came to the first break in the seemingly endless trail of hoofprints he was following. A heap of snow scraped aside and two brown spots on the earth told the story of where the pursued man and horse had paused to rest and sleep. No water was near. Neither the human nor the beast had strayed from the direct line; they had merely halted and dropped almost within their tracks. Just beyond was the spot where the man had remounted, where the flight began anew; and again a tale lay written on the surface of the snow. The prints of the horse's feet were now unsteady and irregular. Within a few rods there was on the right a red splash of blood; then others, a drop at a time. Very hard it had been to put life into the beast at starting; deep the rowels of the great spur had been dug. Ben Blair lightly touched the neck of his buckskin and gave the word to go.