When he reached the stream he found that the deer had spent considerable time there, browsing among the willows, for a good many branches were broken down, twigs and leaves were scattered about over the snow, and the two trails ran across each other in every direction; but, by devoting himself entirely to the tracks made by the larger animal, the young hunter succeeded in following him through all his devious windings, and he finally trailed him out of the willows and back across the valley to the timber that grew at the foot of the hills. Here he stopped, discouraged. “It’s no use,” said he, as he looked about for a fallen log on which he could sit down and rest for a few minutes. “I have followed this trail for two hours and a half,” he added, consulting his watch, “and now I must give it up. They were frightened at something as they passed along here, and began to run. Their tracks show that very plainly, and Thompson says that if a black-tail once makes up his mind that it is necessary for him to show his speed, he will keep it up until——Hello! what’s that?” While Oscar was looking around for a seat, he discovered something he was not looking for, and that was another trail, that led diagonally across the valley from the willows until it struck the trail of the deer, a few yards from the spot on which he stood, and then it turned and followed in the direction in which the game had fled. Oscar ran up to this trail and examined it with no little interest. It was made by a man—a big man, too, judging by the size of his feet—and he wore moccasins. The distance between his tracks showed that he had broken into a run the moment he struck the trail, and this made it evident that he had decided to pursue the deer. “Aha!” said Oscar, shouldering his rifle, and once more setting off at his best pace, “Thompson has the start of me this time. But I can’t imagine how he comes to be here, for I understood him to say that he was going _down_ the valley to the place where we saw that otter-slide. I’ll not go back to camp until I find him.” Oscar now had an opportunity to make some estimate of the speed his guide could put forth when occasion rendered it necessary. He must be set on springs that recoiled sharply whenever his feet touched the ground, Oscar thought, for his tracks were so far apart that the boy could scarcely step into them. Furthermore, he kept up the same pace without intermission for two long, weary miles; and then Oscar began to realize that Big Thompson could run long as well as rapidly. The boy was nearly out of breath by this time; and, after a short burst of speed, made with the hope of coming within sight of his guide, he settled down into a walk. As he moved slowly along, some things Big Thompson had told him in regard to mule-deer came into his mind. The guide had informed him that in vigilance this animal was fully equal to the mountain sheep, and that in cunning he could give a fox points and beat him.