It was Harry's voice and Mr. Cobb made his way to her where she stood at the edge of a thicket of leafless brambles.
"What is it, Harry?" he asked.
For answer she held up a tiny bit of crimson yarn.
"What do you make of this?" asked the instructor, looking at it in a puzzled way.
"I think it came from his sweater!" declared Harry triumphantly. "It was on that branch there."
"Good for you, Harry!" cried Chub, who had joined them ahead of the others. "Roy had his red sweater on and it's money to muffins that thread was pulled out as he went by."
"He didn't go by, though," said Harry. "He went through. Don't you see how the bushes are trampled down? Come on!"
CHAPTER XII
A NIGHT IN THE QUARRY