way—gosh—I don’t know. We did hear that the ancient natives made hidden ways for hundreds of miles; they needed to in order to get away, but it doesn’t seem possible that we can have gone a hundred miles—”

“Anyway, we can’t be a hundred air miles from where we started. What I’m trying to figure is the chances of Bradshaw and some of the rest locating us soon.”

“Yes, they’ll be hunting sure as fate but I’m afraid even if they flew over that place where the planes were left, they would not notice them. Those lads did a good job of covering up.”

“That’s right—”

“Jim, shhh—there’s somebody, a white man, sneaking behind those rocks just ahead of us,” Bob whispered softly.

CHAPTER VI. An Old Enemy Appears

An Old Enemy Appears

His Flying Buddy’s announcement that he saw some one stealing about the ancient ruin was made in such a startled tone, that Austin, for a moment was deeply mystified. They had been through such a ghastly experience that their minds were not functioning normally, and both of them were instantly on the alert for additional danger. For a minute the three stood still, Mills indifferently, but the boys alert and watchful, then suddenly Jim began to think more rationally and he drew a deep breath of relief.

“It’s probably some one looking for us,” he declared. “Let’s go along and catch up with him.” But Bob caught his sleeve.

“Put on the curb, Old Timer, it isn’t anyone looking for us,” he insisted. “Come on, let’s lean against the wall as if we are resting and see what we can see. Keep your gun where it will do the most good in the shortest time.” He stepped leisurely across to the section of wall, and leaned back wearily, while his step-brother also assumed an attitude of fatigue, because he wanted to get more information, not because he was convinced that whoever was about was not a friend.

“What did he look like?”

“Couldn’t tell much. He’s wearing a grey suit, or a dirty white one, and a dark straw hat. I saw him the first time when we crossed the Square. He was up among those trees and I thought it was some kind of wild animal, then I saw him again when we were coming up the stairs from the lower terrace. My first idea was that it was a friend, I was going to shout, but he dodged back out of sight. When I saw him this 

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