"Who do these machines belong to?" asked Dick.
"There's the list," said the watchman, pointing to a written sheet tacked on the wall. "They are No. 15 and No. 9."
The boys looked at the sheet, and read the names of Walter D. Flood and Andrew W. Crossley, two juniors, whom they knew by sight only.
"They wouldn't play this trick on us," whispered Dick to his brothers. "They must have loaned their bicycles to others."
"Right you are," answered Tom. "We'll have to question them."
"Do you know where they room?"
"No; but we can find out from the register."
They entered their dormitory and found out that Flood and Crossley were in the next building, occupying Room 14 together.
"That's luck," said Sam. "We won't have to wake up anybody else."
It was against the rules to be prowling around the dormitories so late at night, so the Rovers had to be cautious in their movements. They mounted the stairs to the second floor and had to hide in a corner while a proctor marched past and out of hearing. Then, aided by the dim, light that was burning, they located No. 14.
