"I'd like to run across Delton," thought Bud, feeling unconsciously for his gun. His hand encountered no holster, and he suddenly realized that he had not bothered to arm himself before starting out.

"Just as well that I don't see Delton," he said to himself a trifle ruefully. "Wouldn't do me a lot of good to meet him when I haven't a ghost of a show of bringing him in. Yet I might take a chance on him if I saw him first." The pony he was riding stepped carefully so as to avoid prairie dog holes, which would throw him and his rider if he stepped in one suddenly.

"Might be a good idea to turn around," thought Bud aloud. "Don't want to leave the work of the ranch to Nort and the Kid and Billee, though there isn't an awful lot to do yet. When those sheep come in we'll have our hands full. Oh, well, guess I'll ride a bit farther. See how much more work this fence needs."

He was riding slowly now, looking carefully about him. The country appeared vaguely familiar. Certain bushes looked as though he had seen them before—there was a small tree that he had certainly passed some time before. The cowboy's sight is so trained by years on the prairie that even the shape of a bush will be remembered subconsciously. There is so much land in the west that it is necessary to have some means to guide oneself about, else a rider could very easily get lost along a trail that should be familiar.

"Seems to me I've been here before," Bud said. "Let's see now—that bush. Know I saw that sometime. That little hill there—why—I'll bet that is—" he spurred his mount to a faster gait and made for a small knoll that rose in front of him. As he reached it he gave a yell.

"I know now! This is where we got in that fight with the hidden gunman! And over there ought to be—sure enough! The water hole! I didn't think we were so near it. I must have come further than I thought. Well—might as well take a look around. Right here is where the bird that did all the shooting must have lain. Come here, bronc!"

The boy dismounted and slipped his horse's bridle rein on his wrist. Then he threw himself down on the sand in the position their antagonist might have taken when he fired at them.

"Here I am with a view of the water hole, and in a good place to shoot from without being shot. Now I want to get away quick. What do I do? If I roll to the left, I expose myself to fire. If I roll to the right, I—" there was a little clump of mesquite by his right elbow. Bud pulled himself toward this. "That would afford protection, but once I get in here how can I get out? Now—" The boy was rolling to the center.

With a "Hold it, bronc!" he released the reins and his hand slid off the clump. Suddenly a queer thing happened. Bud felt the ground below him give way, and the next moment he found himself in a hole just large enough to admit his body, and about four feet deep. Above him the bushes had closed again, effectively screening him from the view of anyone above ground. He had accidentally solved the mystery of the gunman's strange disappearance.

For a few seconds Bud lay still, so sudden was the shock of the fall. He was not really stunned, however, and as soon as he recovered from his surprise he struggled to his feet and parted the brush above him. His horse was near by, moving slowly and cropping grass.