Frank sat down on a stool by the counter to wait.
Presently the cash-boy came back, and the proprietor of the store with him. He was a portly man, with a loud voice and an air of authority. To him the cash-boy pointed out Frank.
"Are you the purchaser of these handkerchiefs?" he asked.
"Yes, sir," answered Frank, rather surprised at the question.
"And did you offer this twenty-dollar bill in payment?"
"Yes, sir."
"Where did you get it? Think well," said the trader, sternly.
"What is the matter? Isn't the bill a good one?" asked Frank.
"You have not answered my question. However, I will answer yours. The bill is a counterfeit."
Frank looked surprised, and he understood at a flash why he had been trusted with two of these bills when one would answer.