"Why doesn't it go 'round then?" asked Violet, Laddie's twin sister. "Why doesn't it go 'round, Russ? I thought wheels always went around!" Vi, as Violet was usually called, loved to ask questions, and sometimes they were the kind that could not be easily answered. This one seemed to be that kind, for Russ went on whistling and did not reply. "Why doesn't the footstool go around if it's a wheel?" asked Vi again. "Oh, 'cause—'cause——" began Russ, holding his head on one side and stopping halfway through his whistled tune. "It doesn't go 'round?" "Oh, I got a riddle! I got a riddle!" suddenly cried Laddie, who was as fond of asking riddles as Vi was of giving out questions. "What kind of a wheel doesn't go 'round? That's a new riddle! What kind of a wheel doesn't go 'round?" "All wheels go around," declared Russ, who, now that he had the footstool fixed where he wanted it, had started his whistling again. "What's the riddle, Laddie?" asked Vi, shaking her curly hair and looking up with her gray eyes at her brother, whose locks were of the same color, though not quite so curly as his twin's. "There she goes again! Asking more questions!" exclaimed Rose, who had come back from putting away the broom, and was ready to play the steamboat game with her older brother. "But what is the riddle?" insisted Vi. "I like to guess 'em, Laddie! What is it?" "What kind of a wheel doesn't go 'round?" asked Laddie again, smiling at his brothers and sisters as though the riddle was a very hard one indeed. "Pooh! All wheels go around—'ceptin' this