“I see. You are sure you didn’t hand any blanks around? That particular box looks like the real thing.”

“Yes, sir—I was very careful.”

Captain Putnam strode over to the rock and shoved back the lid of the case.

“Why, the top layer of cartridges is gone!” he cried. “Was the box full when you opened it?”

“Why—er—yes, sir—I think so, sir,” stammered the quartermaster of the school battalion. “It looked full to me.”

“Young gentlemen,” went on Captain Putnam, raising his voice. “Please to look over the cartridges you have left.”

There was a hasty examination by over a score of cadets.

“Mine are O. K., sir.”

“So are mine.”

“Here, I’ve got a blank!” cried Andy Snow, rushing forward and holding it up. “It’s one of the kind we used to have—those that looked so much like the ball cartridges.”