It was found that each tire had some glass in it, and the bits were picked out with care.  While this was going on Dick suddenly swung the lamp around so that its rays struck through the trees and bushes lining the roadway.

“Look! look!” he cried.  “There is somebody watching us!”

“The fellow who is guilty,” added Sam.

“Catch him!” came from Tom, and he made a quick rush forward.

“Say, we’ve got to get out of here,” came in a low voice from among the trees.  “Run for all you are worth!”

“I told you to get back,” said another voice “Come on this way.”

A crashing through the brushwood back of the trees followed.  Dick held up the lamp and threw the rays in the direction of the sounds.  He and his brothers caught a glimpse of two boys or men hurrying away.

“Stop, or I’ll shoot!” cried Tom, although he had no weapon at his command.  But this cry only made the fleeing ones move the faster.

“Sam, you stay with the girls,” said Dick quickly.  “Tom and I can go after those rascals.”

“All right, but take care; they may be dangerous,” answered the youngest Rover.

Tom had picked up a good sized stone.  Now he hurled it ahead into the bushes.  A cry of alarm followed, but whether he hit anybody or not he could not till.

Holding the lamp so that it would light up the scene ahead, Dick and Tom ran through the grove of trees and then into the thicket of brushwood beyond.  They could hear two persons working their way along, and knew they must be the fellows they were after.  Once they caught sight of the rascals, but the evildoers lost no time in seeking cover by running for another patch of undergrowth.

“Say, this is fierce!” cried Tom as he stepped into a hole and tumbled headlong.

“Well, it’s just as bad for those fellows,” answered Dick grimly.

“Yes, but I reckon they are not dressed up as we are,” Tom had on his tuxedo and a white tie, and Dick was similarly attired.  But over the dress suit each wore a linen coat, buttoned close up to the neck.

The two youths kept on until, much to their surprise, they came out on a back road that was almost as good as the highway they had left.  Here was a rail fence, and as they halted at this Tom pointed down the road a distance.

“Somebody on wheels,” he cried.  “Turn the light on ’em!”

Dick did as requested, and to their astonishment they beheld two young fellows on bicycles.  They had their heads bent low over the handlebars, and were streaking along at top speed.  Soon a bend of the road hid them from view.

“Those are the chaps who put that glass in the roadway,” said Tom.

“I believe you,” answered his brother.  “They came up here on their wheels and walked through the woods to do it.  The question is, who are they?”

“They are enemies of ours,” was the prompt answer.

“Yes; but how did they know we were coming this way, and in the auto?”