Blue Bob must have had a last name, but none of the little fellows knew what it was. Everybody called him Blue Bob because he had such a thick, black beard that when he was just shaved his face looked perfectly blue. He knew all about the river and its ways, and if it had been of any use to go out with a boat, he would have gone. That was what all the boys said, when they followed Blue Bob to the bridge and saw him getting out on the pier. He was the only person that the watchman had let go on the bridge for two days. The water was up within three feet of the floor, and if Jim Leonard's roof slipped by Blue Bob's guard and passed under the bridge, it would scrape Jim Leonard off, and that would be the last of him. All the time the roof was coming nearer the bridge, sometimes slower, sometimes faster, just as it got into an eddy or into the current; once it seemed almost to stop, and swayed completely round; then it just darted forward. Blue Bob stood on the very point of the pier, where the strong stone-work divided the current, and held his hooked pole ready to make a clutch at the roof, whichever side it took. Jim Leonard saw him there, but although he had been holloing and yelling and crying all the time, now he was still. He wanted to say, "O Bob, save me!" but he could not make a sound. It seemed to him that Bob was going to miss him when he made a lunge at the roof on the right side of the pier; it seemed to him that the roof was going down the left side; but he felt it quiver and stop, and then it gave a loud crack and went to pieces, and flung itself away upon the whirling and dancing flood. At first Jim Leonard thought he had gone with it; but it was only the rat that tried to run up Blue Bob's pole, and slipped off into the water; and then somehow Jim was hanging onto Blue Bob's hands and scrambling onto the bridge. Blue Bob always said he never saw any rat, and a good many people said there never was any rat on the roof with Jim Leonard; they said that he just made the rat up. He did not mention the rat himself for several days; he told Pony Baker that he did not think of it at first, he was so excited. Pony asked his father what he thought, and Pony's father said that it might have been the kind of rat that people see when they have been drinking too much, and that Blue Bob had not seen it because he had signed the temperance pledge. But this was a good while after. At the time the people saw Jim Leonard standing safe with Blue Bob on the pier, they set up a regular election cheer, and they would have believed anything Jim Leonard said. They all agreed that Blue Bob had a right to go home with Jim and take him to his mother, for he had saved Jim's life, and he ought to have the credit of it.