Immediately ceasing his attack on Frank, the fellow made a twisting wrench and broke away. But when he turned to run toward the end of the Bridge he saw a uniformed officer coming toward him on the jump. Then he whirled back, but Frank Merriwell blocked his path. In sudden desperation, determined not to be captured, the man leaped upon the parapet and prepared to spring down to the track along which the trolley-cars passed below. Several who witnessed this desperate act also saw a car coming right at hand, and shouted for him not to jump, thinking he would fall directly before it. Frank sprang forward, to clutch the man’s long coat, but, with a cry of defiance that sounded almost maniacal the fellow leaped. He struck fairly on the top of the passing car, which carried him away, crouching there and shaking his fist at Frank. “A madman beyond a doubt!” Frank exclaimed. The fellow had escaped, for the officer would not do anything until he had questioned Frank and learned the meaning of what had happened. By that time it was too late. When Merry finally resumed his walk over the Bridge his mind was in a state of wonderment. He was much dissatisfied with himself for permitting the man to escape, but he had fancied the fellow fairly penned between himself and the officer, never anticipating the desperate expedient to which the stranger resorted. Merriwell had again seen the face of the man fairly, and more than before was he certain he had not been acquainted with the fellow in the past. Of course, man and girl were connected somehow, and from the wild words of the desperate stranger Frank inferred that he was in love with her. That the man also believed Merriwell had somehow done the girl an injury was also certain. He had spoken of Boston, and that set Merry to thinking of the girls he had known there, but try as he might, he could not remember that he had ever met this one there. “This business is becoming altogether too perplexing,” he confessed to himself, as he swung along on his way over the great bridge. “If I had plenty of time, I might make an attempt to solve it, but I doubt if I’d feel repaid for my pains if I did so. I must go back to New Haven to-morrow. Inza has left, and there is no real reason why I should linger longer. Still, it is a nuisance to have to leave before I find out the name of that girl and just why the man is so anxious to kill me. If I had held him, the truth might have been forced from him.” He was not molested again during the walk, and he felt that adventures enough for one day had befallen him. Leaving the Bridge at the New York end, he crossed to Broadway, and was on the point of taking a car, crowded though it was, when a hansom cab without a fare came along. He hailed it, and a minute later he was seated inside, jolting northward.