THE MASKED RIDER
robbers' retreat, he would have recognized them as rustlers. The discerning eye of a rider saw the signs of a long, arduous trip. These men were packing in supplies from one of the northern villages. They were tired, and their horses were almost played out, and the burros plodded on, after the manner of their kind when exhausted, faithful and patient, but as if every weary, splashing, slipping step would be their last.
All this Venters noted in one glance. After that he watched with a thrilling eagerness. Straight at the waterfall the rustlers drove the burros, and straight through the middle, where the water spread into a fleecy, thin film like dissolving smoke. Following closely, the rustlers rode into this white mist, showing in bold black relief for an instant, and then they vanished.
Venters drew a full breath that rushed out in brief and sudden utterance.
"Good heaven! Of all the holes for a rustler! . . . There's a cavern under that waterfall, and a passageway leading out to a cañon beyond. Oldring hides in there. He needs only to guard a trail leading down from the sage-flat above. Little danger of this outlet to the pass being discovered. I stumbled on it by luck, after I had given up. And now I know the truth of what puzzled me most—why that cattle trail was wet!"
He wheeled and ran down the slope, and out to the level of the sage-brush. Returning he had no time to spare, only now and then, between dashes, a moment when he stopped to cast sharp eyes ahead. The abundant grass left no trace of his trail. Short work he made of the distance to the circle of cañons. He doubted that he would ever see it again; he knew he never wanted to; yet he looked at the red corners and towers with the eyes of a rider picturing landmarks never to be forgotten.
Here he spent a panting moment in a slow-circling gaze of the sage-oval and the gaps between the bluffs. Noth-
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