"What's the matter?" asked the chauffeur. "I pounded my finger!" said the little boy, as he popped it into his mouth. "It hurts!" But he did not cry. "Yes, it generally does hurt when you hit your finger or thumb with a hammer," said William. "Better let me finish that for you. I can put the wheels on so they won't come off." "I wish you would then," said Russ. "We want to see how it works." William did not take long to fasten the four wheels to the long, narrow board, two wheels on each end, so that it could easily coast down the sidewalk hill in front of Aunt Jo's house. Then, to the front of the narrow board, just as Russ had explained, William nailed a handle, making it stick straight up, so it could be grasped by whoever was taking a ride. "Now your skate wagon is done," he said. "Let's go out and try it!" cried Laddie. "But I've got to have a turn," insisted Rose. "It's my skate." "You shall all have turns," put in Mother Bunker, who had come out to the garage to see how matters were going. "That is, all except Mun Bun and Margy. I'm afraid they're too little to coast. They might fall off." "I'll hold 'em on and give 'em a ride," offered Russ, who was very kind to his little brother and sister. "You can have the first ride," said Laddie to Rose, "'cause it's your roller skate." "I can't go first," answered the little girl. "I don't know how you do it. You go first, Russ." Russ was very willing to do this. So he took the skate wagon to the top of the sidewalk "hill," as the little Bunkers called it, and then he put one foot on the flat board, to which were fastened the roller-skate wheels. "You have to push yourself along with one foot, just the same as when you're skating on one skate," explained Russ. "Then when you get to going fast you put the other foot on the board and stand there, and you hold on tight and down you go." "Show me!" begged Rose, jumping up and down because she was so excited and pleased. And then Russ went riding downhill, almost as nicely as he coasted on the snow in winter. "Is it fun?" shouted Laddie, from where he stood with Rose at the top of the hill--only almost no one would have called such a slight grade a "hill." "Lots of fun!" answered Russ. Down to the bottom of the hill he rode, and then he walked up. "Now it's your turn, Rose," he said, as he handed her the skatemobile. But the little girl shook her head. "I'll watch a little more," she said. "Let Laddie go." So Laddie coasted down. Then Rose took her turn. Down the sidewalk hill she coasted on the skate wagon, and she was just turning around to wave to her mother and her brothers, who were watching her, when all of a sudden out from a gate ran a little dog. Right in front of Rose, and a little ahead of her he ran, and then he stood on the sidewalk and barked at her. "Look out, Rose! Look out!" cried her mother. "Steer to one side! Turn out for him!" yelled Russ.