"Did you ever know Gus Plum to be interested in stamps?"
"No."
"Were the letters addressed to him?"
"I don't know. Strange as it may seem, I couldn't find any of the written-on portions of the envelopes."
"Did Plum see you?"
"Not until later—when I was on my way back to the Hall."
"What did he say?"
"Nothing. He acted as if he wanted to avoid me."
After this the pair talked the matter over for several minutes, but could reach no satisfactory conclusion regarding the bits of paper.
"Do as you think best, Chip," said Dave, at last. "If you want to go to Doctor Clay, I fancy he will be glad to hear what you have to say."
"Well, if Plum has those lost stamps, don't you think he should be made to return them?"
"By all means. But you've got to prove he has them first, and the doctor won't dare to say any thing to Plum until he is sure of what he is doing. Otherwise, Plum's father could raise a big row, and he might even sue the doctor for defamation of character, or something like that."
A little later found Chip Macklin in the doctor's office. The small boy was rather scared, but told
