Poor little Jim looked very much troubled; for, if Rob said he could not be fooled, of course he couldn't be; and he did want to play a trick on Rob so badly! At last he sprang up, saying, "I'm going to ask mamma;" and ran out of the room. Rob waited a while; but Jim did not come back: so he yawned, stretched, and went to bed.
Next morning, bright and early, up jumped Jim, pulled on his clothes; wrong-side out and upside down (for he was not used to dressing himself), and crept softly downstairs.
An hour or two later, Rob went slowly down, rubbing his eyes. He put on his cap, and took up the pail to go for the milk; but it was very heavy. What could be the matter with it? Why, somebody had got the milk already. Just then, Jim appeared from behind the door, crying, "April Fool! April Fool! You thought I couldn't fool you; but I did."

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