a scientific diddle is this. The diddler approaches the bar of a tavern, and demands a couple of twists of tobacco. These are handed to him, when, having slightly examined them, he says:
“I don’t much like this tobacco. Here, take it back, and give me a glass of brandy and water in its place.” The brandy and water is furnished and imbibed, and the diddler makes his way to the door. But the voice of the tavern-keeper arrests him.
“I believe, sir, you have forgotten to pay for your brandy and water.”
“Pay for my brandy and water!—didn’t I give you the tobacco for the brandy and water? What more would you have?”
“But, sir, if you please, I don’t remember that you paid me for the tobacco.”
“What do you mean by that, you scoundrel?—Didn’t I give you back your tobacco? Isn’t that your tobacco lying there ? Do you expect me to pay for what I did not take?”