“If you don’t come back in an hour,” repeated Jimmie, “I’ll come after you! In an hour it will be time to leave for home.”

Carl went away up the slope, climbing swiftly, and soon disappeared from view. Jimmie threw himself down on the ground close to the framework of the Louise, in a measure protected from view by the planes.

“Gee!” mused the boy. “It’s lonesome, waiting like this. Next time we go out on a scouting expedition, we’ll bring some one along to stand guard. This waiting makes me tired.”

But the period of waiting was destined to be a short one. Hardly had Carl disappeared over the summit of the ridge when three figures appeared there, sharply outlined against the sky. Jimmie crawled closer under the planes and lay perfectly still for some moments.

He saw the men pointing toward the aeroplane, heard them shouting to some one on the other side. Then they came on down the slope, half-running, half-sliding in their haste.

“Now, that’s a nice thing!” the boy mused. “They are probably wise to what we were up to, and stood ready to make a run as soon as we landed. I wish I knew whether Carl butted into them or whether he got away.”

All doubt regarding the matter was settled the next moment, for Carl appeared on the summit, accompanied by three husky-looking men. The men beckoned to Jimmie and called out to those who were running down the slope. It was clear that they were inviting him to remain where he was until the others came up.

Jimmie could not see the face of his chum, of course, the distance being too great. In fact, he only knew that it was Carl because of his being smaller than the others. He could, however, distinguish motions made by the boy, and these motions commanded him, as plainly as words could have done, to get the Louise away before the arrival of the men who were descending the slope.

Unwilling to leave his chum without knowing more of the situation, Jimmie hesitated. As he did so, he saw Carl drawn violently over the ridge. The last movement he saw was made by the boy’s outstretched arms, commanding him to take the Louise into the air as soon as possible!

He hesitated no longer but sprang to the seat and set the motors in motion. The machine lifted clumsily, for the landing had not been a smooth one, but finally got her into the air, not more than a score of feet distant from the men who were rushing down upon her.