“They have ridden in among the hills, where they are out of sight, but that will make little difference, as long as I stick to their trail——”

He checked his utterance in dismay, for, looking down at the ground, he discovered that he was not on the track of the party at all. While rapt in a brown study, his pony had left it, and the anxious eyes which scanned the prairie on all sides failed to detect the first imprint of a horse’s hoofs.

“Well, this is a pretty pass!” he exclaimed impatiently, as he reined up; “I left it to you, Jill, not doubting that you would attend to business; but, after all, it was my own fault.”

Reflection, however, convinced him that the case was not so bad after all. He could not be far astray, and he decided to press on toward the hills, and gallop along their base, until he struck the missing trail.

That which caused him anxiety was the lateness of the hour. The top of the ridge already shut the sun from sight, and, ere long, night would close over the scene, so obscuring the footprints that further search must be hopeless.

It was this fact which caused him to touch his spur sharply against the side of Jill, and force him to a pace that he would not have done in his tired condition, but for the urgency of the case.

Jill responded gamely to the demand, galloping with a speed that caused the still wind to whistle by the rider’s face. The hills were so close that a half hour carried him to the base, and he once more brought the animal down to a walk.

It was now a question whether he was too far north or too far to the south of the point of entrance by the party in advance. If he should err, there was not enough daylight remaining to correct the mistake; he would of necessity be forced to wait until morning before going on.

Since he had to guess at it, he acted on the theory that he had struck the ridge to the south. He therefore wheeled his pony to the right, and touched him into a leisurely canter, while he kept his eyes fixed on the ground, as it swept under the hoofs of the animal.

It was certainly remarkable that Herbert’s thoughts remained so fixed upon what was in front that he gave little or no attention to the rear. Once, it is true, he glanced back over the long space ridden during the day, and noted that the ridge, which had been the scene of his stirring experience of the previous night, was fast fading from sight; but the survey was so brief and hasty that it failed to take in an important feature in which he was directly concerned.