"Who is this man who gave it to you? Do you know him?"
"He said his name was Smithson, from Philadelphia. I never saw him before this morning."
"What were you to do with the change I gave you back? Did he tell you to keep it?"
"No, sir. I was to meet him in the park in an hour and give it to him."
"He has been making a catspaw of you."
"I don't understand," said Ben.
"Knowing the bill to be bad, he did not venture to offer it himself, as it would make him liable to arrest."
"Arrest!" exclaimed Ben, in dismay.
"Yes. One who knowingly offers a counterfeit bill is liable to arrest and imprisonment."
"I hope you don't think I knew anything about it," said Ben alarmed.