“Another exhibition like that,” he said, sharply, “and the class stays in after school, O’Hara!”

“Sir?”

“Silence.”

“I said nothing, sir, really.”

“Boy, you made a cat-like noise with your mouth.”

“What sort of noise, sir?”

The form waited breathlessly. This peculiarly insidious question had been invented for mathematical use by one Sandys, who had left at the end of the previous summer. It was but rarely that the master increased the gaiety of nations by answering the question in the manner desired.

Mr Banks, off his guard, fell into the trap.

“A noise like this,” he said curtly, and to the delighted audience came the melodious sound of a “Mi-aou”, which put O’Hara’s effort completely in the shade, and would have challenged comparison with the war-cry of the stoutest mouser that ever trod a tile.

A storm of imitations arose from all parts of the room. Mr Banks turned pink, and, going straight to the root of the disturbance, forthwith evicted O’Hara.