“I think I’ve got a clue!” was the reply. “See these dots placed in the form of triangles? Well, look around the car and see if you can find any more of them.”
Feeling sure that their cousin had discovered something of importance, the other boys made a minute inspection of the car, aided by Jack. Presently Fred pointed out a series of dots on the dashboard, evidently made with the point of a knife blade. These dots also were in the form of a triangle.
“And here’s another one on the top of the back door!” cried Randy. “Jack, what in the world does this mean?”
“Don’t you remember who used to make these dotted triangles?” questioned the oldest Rover boy. “Put on your thinking caps and go back to your school days at Colby Hall.”
All of the lads stared at him in wonder and then dropped their eyes and began to think deeply. Then suddenly one after another they set up a shout:
“Slugger Brown!”
CHAPTER XXI
THE BOYS REACH A DECISION
It was with good reason that the Rover boys mentioned Slugger Brown’s name in connection with the discovery they had made. All remembered clearly how the bully of Colby Hall had had the habit of placing dots in a triangle, not only while in the classroom but also when discussing affairs at the gymnasium meetings and while at the military school encampments.
“It’s undoubtedly the work of Slugger,” said Jack. “I’ve seen him put down those dots in triangles hundreds of times.”