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; and soon a close inspection of the biplane was in progress.
"I don't see any damage," said Dick, presently.
"Most likely they didn't have time to do any," replied Tom.
"I'm glad of it," added Sam, with a sigh of relief.
"Who would be so mean ?" questioned Stanley.
"I've got my suspicions, but I won't say anything yet," answered Dick.
A proctor and several instructors had come down to the shed, and the situation had to be explained to them.

All thought it mean that anybody should try to damage the flying machine.
"Perhaps it was merely a boyish trick," said Professor Blackie.