janitor's son, with a sigh of relief. "I was afraid them pesky rascals was a-coming back."
"What rascals?"
"The fellers as got at the airship while I was asleep. But I guess they didn't get no chance to hurt anything," went on Abner, hastily.
"Who were they?" asked Tom.
"I don't know. They had rags tied over their faces, so I couldn't see 'em."
"How many of them were there?" questioned Dick.
"Two."
"Are you sure they didn't harm anything?" went on the eldest Rover boy, as he entered the shed.
"No, I ain't sure, for when I woke up they was in the shed, right under my hammock. I got scared and I blazed away at the roof, and then they got scared, I can tell you! They jumped and let out a yell, and ran for the door, and I got down and went to the door and fired the other barrel into the air, as a warning. Then they disappeared in the darkness."
"I guess it was" began Tom, when Dick caught hold of his arm and silenced him.
"We'll take a look at the machine," said the big brother, and they went into the shed. Here they were soon joined by Sam and the others;
