The whole party had been standing for some minutes opposite to the post-office, which looked like a rainbow of coloured lamps, and Harry was beginning, for the twentieth time, to try if he could count how many there were, when Major Graham felt something twitching hold of his coat pocket behind, and on wheeling suddenly round, he perceived a little boy, not much older than Harry, darting rapidly off in another direction, carrying his own purse and pocket-handkerchief in his hand. Being still rather lame, and unable to move very fast, Major Graham could only vociferate at the very top of his voice, "Stop thief! stop thief!" but not a constable appeared in sight, so the case seemed desperate, and the money lost for ever, when Frank observed also what had occurred, and being of an active spirit, he flew after the young thief, followed closely by Harry. An eager race ensued, up one street, and down another, with marvellous rapidity, while Frank was so evidently gaining ground, that the thief at last became terrified, and threw away the purse, hoping thus to end the chase; but neither of his pursuers paused a moment to pick it up, they were so intent upon capturing the little culprit himself. At length Frank sprung forward and caught him by the collar, when a fierce conflict ensued, during which the young thief was so ingenious, that he nearly slipped his arms out of his coat, and would have made his escape, leaving a very tattered garment in their hands, if Harry had not observed this trick, and held him by the hair, which, as it was not a wig, he could not so easily throw off. At this moment, a large coarse ruffianly-looking man hurried up to the party, evidently intending to rescue the little pick-pocket from their custody; so Frank called loudly for help, while several police-officers who had been sent by Major Graham, came racing along the street, springing their rattles, and vociferating, "Stop thief!" Now, the boy struggled more violently than ever to disentangle himself, but Frank and Harry grasped hold of their prisoner, as if they had been a couple of Bow Street officers, till at length the tall fierce man thought it time to be off, though not before he had given Harry a blow on the face, that caused him to reel back, and fall prostrate on the pavement. "There's a brave little gentleman!" said one of the constables, helping him up, while another secured the thief. "You ought to be knighted for fighting so well! This boy you have taken is a sad fellow! He broke his poor mother's heart a year since by his wicked ways, and I have long wished to catch him. A few weeks on the tread-mill now, may save him from the gallows in future." "He seems well practised in his business," observed Major Graham. "I almost deserved; however, to lose my pocket-book for bringing it out in a night of so much crowding and confusion. Some lucky person will be all the richer, though I fear it is totally lost to me."