"He isn't here," said Uncle Fred. "I'd have felt him if he had come into my berth. I'll get up and help you look."

Uncle Fred quickly slipped on a bath robe and stepped out into the aisle of the car. Then he and Daddy Bunker and the porter stood there in the dim light.

"Did you find him, Charles?" asked Mrs. Bunker in a low voice from her berth.

"No, he wasn't with Fred."

"Oh, dear! What shall we do? You must find him!" she exclaimed, as she poked her head out between the curtains.

"Well, ma'am, he couldn't fall off the train," said the porter, "'cause we hasn't stopped for a long while, and the doors are tight closed at each end of the car. He's here somewhere."

"He's in some other berth," put in Uncle Fred. "He must have walked in his sleep, or something like that, and he's in with some one else he has mistaken for his father or his mother, or one of his sisters or brothers. We'll find him."

"But we can't wake up everybody in the car, to ask them if Mun Bun is sleeping with them," said Mr. Bunker.

"We've just got to!" exclaimed his wife. "We must find Mun Bun!"

The porter looked disturbed. He did not very much like to awaken all the sleeping passengers in the train, for some of them were sure to be cross. They might blame him for their loss of sleep, and then he would not get the usual tips of quarters or half dollars or dollars at the end of the ride.