The lap robe of the car was moving.
"What can it be?" exclaimed the Englishman.
They lifted the lap robe. There, crouching on the floor of the car and looking up at them with friendly eyes, was Philippe's dog, Trompke.
"Trompke!" cried Philippe, "How did you get in? Shame!"
The puppy's tail went thump, thump! on the floor.
"Oh, I'm sorry," said Philippe. "I'll take him back if you'll stop the car."
"Never mind," laughed the Englishman. "Let him go along. He must have jumped in while we were saying goodbye to your mother."
"He would not let me go off without him," said Philippe. "He is so used to coming along."
So Trompke made the fourth traveler.