"Will you give me those kites?" Joe demanded, advancing determinedly. "Will you fight for 'em?" was Simpson's counter-demand. "Yes," Joe answered. "Fight! fight!" the gang began to howl again. "And it 's me that 'll see fair play," said a man's heavy voice. All eyes were instantly turned upon the man who had approached unseen and made this announcement. By the electric light, shining brightly on them from the corner, they made him out to be a big, muscular fellow, clad in a working-man's garments. His feet were incased in heavy brogans, a narrow strap of black leather held his overalls about his waist, and a black and greasy cap was on his head. His face was grimed with coal-dust, and a coarse blue shirt, open at the neck, revealed a wide throat and massive chest. "An' who 're you?" Simpson snarled, angry at the interruption. "None of yer business," the newcomer retorted tartly. "But, if it 'll do you any good, I 'm a fireman on the China steamers, and, as I said, I 'm goin' to see fair play. That 's my business. Your business is to give fair play. So pitch in, and don't be all night about it." The three boys were as pleased by the appearance of the fireman as Simpson and his followers were displeased. They conferred together for several minutes, when Simpson deposited the bundle of kites in the arms of one of his gang and stepped forward. "Come on, then," he said, at the same time pulling off his coat. Joe handed his to Fred, and sprang toward Brick. They put up their fists and faced each other. Almost instantly Simpson drove in a fierce blow and ducked cleverly away and out of reach of the blow which Joe returned. Joe felt a sudden respect for the abilities of his antagonist, but the only effect upon him was to arouse all the doggedness of his nature and make him utterly determined to win. Awed by the presence of the fireman, Simpson's followers confined themselves to cheering Brick and jeering Joe. The two boys circled round and round, attacking, feinting, and guarding, and now one and then the other getting in a telling blow. Their positions were in marked contrast. Joe stood erect, planted solidly on his feet, with legs wide apart and head up. On the other hand, Simpson crouched till his head was nearly lost between his shoulders, and all the while he was in constant motion, leaping and springing and manoeuvering in the execution of a score or more of tricks quite new and strange to Joe.