"Didn't put any bent pins in the teacher's chair, did you?"
"No, sir."
The boy hoped the captain would not ask him what other prank he had been up to, for the truth was that Bob had that morning taken a live mouse to the classroom, releasing it during a study period, and nearly sending the woman teacher and the girl pupils into hysterics. His part had not been discovered, but the teacher had threatened to keep the whole class of boys in that night until the guilty one confessed, and Bob knew he would have to tell sooner or later, if some of his companions did not "squeal" on him, in order that they might be released from suspicion.
"That's right," went on the mariner. "Never put bent pins in the teacher's chair."
As Bob feared, some one during the afternoon session told of his part in the mouse episode, and he was the only one kept in. The teacher made him stay while she corrected a lot of examination papers, and in the silent schoolroom the boy began to wish he had not been so fond of a "joke."
The teacher, who was a kind-hearted woman, talked seriously to her rather wild pupil, pointing out that it was a cowardly thing for a boy to frighten girls. Bob had never looked at it in just that light, and he was pretty well ashamed of himself when he was allowed to go home, with an admonition that he must mend his ways or be liable to expulsion.
"I'll bet he's been up to some mischief, Lucy," said Captain Spark when Bob came home quite late that afternoon.
"Perhaps he has. I hope it was nothing serious."
"Shall I ask him what it was?"
"No, we'll find it out sooner or later, and I don't want his father to worry more than he has to. He has hard work at the mill, and I like his evenings to be as free from care as possible."