"I know them," said the young man. "They are customers of mine." Jimmie wondered in what way Carroll and Hastings were customers of the white-haired young man. Judging him by his outer garments, Jimmie guessed he was a Fifth Avenue tailor; he might be even a haberdasher. Jimmie continued. He lived, he explained, with his mother at One Hundred and Forty-sixth Street; Sadie, his sister, attended the public school; he helped support them both, and he now was about to enjoy a well-earned vacation camping out on Hunter's Island, where he would cook his own meals, and, if the mosquitoes permitted, sleep in a tent. "And you like that?" demanded the young man. "You call that fun?" "Sure!" protested Jimmie. "Don't you go camping out?" "I go camping out," said the good Samaritan, "whenever I leave New York." Jimmie had not for three years lived in Wall Street not to understand that the young man spoke in metaphor. "You don't look," objected the young man critically, "as though you were built for the strenuous life." Jimmie glanced guiltily at his white knees. "You ought ter see me two weeks from now," he protested. "I get all sunburnt and hard--hard as anything!" The young man was incredulous. "You were near getting sunstruck when I picked you up," he laughed. "If you're going to Hunter's Island, why didn't you go to Pelham Manor?" "That's right!" assented Jimmie eagerly. "But I wanted to save the ten cents so's to send Sadie to the movies. So I walked." The young man looked his embarrassment. "I beg your pardon," he murmured. But Jimmie did not hear him. From the back of the car he was dragging excitedly at the hated suit-case. "Stop!" he commanded. "I got ter get out. I got ter walk." The young man showed his surprise. "Walk!" he exclaimed. "What is it--a bet?" Jimmie dropped the valise and followed it into the roadway. It took some time to explain to the young man. First, he had to be told about the scout law and the one good turn a day, and that it must involve some personal sacrifice. And, as Jimmie pointed out, changing from a slow suburban train to a racing-car could not be listed as a sacrifice. He had not earned the money, Jimmie argued; he had only avoided paying it to the railroad. If he did not walk he would be obtaining the gratitude of Sadie by a falsehood. Therefore, he must walk. "Not at all," protested the young man. "You've got it wrong. What good will it do your sister to have you sunstruck? I think you are sunstruck. You're crazy with the heat. You get in here, and we'll talk it over as we go along." Hastily Jimmie backed away. "I'd rather walk," he said. The young man shifted his legs irritably. "Then how'll this suit you?" he called. "We'll declare that first 'one good turn' a failure and start afresh. Do me a good turn." Jimmie halted in his tracks and looked back suspiciously.