"Oh, indeed," returned the professor, sarcastically. "A piece of blank paper, eh? You're quite sure it was a piece of blank paper?"
"It was until I began to figure on it."
"Oh, you're quite sure of that?"
"I am, sir."
"And I can tell you, and I'll make an example of you to the whole class in so doing, that when you thought to conceal that paper by crumpling it up in your hand, I caught sight of the under side of it."
Frank made no response. He had not the slightest idea what the professor was driving at.
"I tell you, I saw what it was in an instant," added the professor.
"Very well, sir," said Frank, rather sharply, "I've nothing to say."
"Oh, you haven't! Very well, then, what's that?"
The professor pointed to the printed examination paper which lay on the desk in plain sight.