"Now, look here!" said Mark, in a recklessly loud voice, for he was angry, believing that the boy was lying. "Now, look here! I've been fooled with one letter this way, and I don't mean to be fooled again. If this is a trap of those cadets, as sure as I'm alive, I'll report the matter to the superintendent and have you court-martialed. Remember! And now I give you a chance to take it back. If you tell me the truth I'll let you go unhurt. Now, once more, who gave you this?"