He came back with his shotgun carefully hidden behind him, and then he and I showed Fluff the two guns simultaneously. For one minute Fluff was startled. Then he vanished. All we saw of him as he went was the dust he left in his wake. Massett had come over when Brownlee brought over his gun, and Murchison and I sat and smoked while Massett and Brownlee fought out the periodicity of Fluff. Brownlee said that for two guns Fluff would traverse the same distance as for one, but twice as quickly; but Massett said Brownlee was foolish, and that anyone who knew anything about dogs would know that no dog could go faster than Fluff had gone at the sight of one gun. Massett said Fluff would travel at his regular one-gun speed, but would travel a two-gun distance. He said Fluff would not be back for ninety-six hours. Brownlee said he would be back in forty-eight hours, but both agreed that he would travel twenty-eight hundred and eighty miles. Then Murchison went home and got a map, and showed Brownlee and Massett that if Fluff traveled fourteen hundred miles in the direction he had started he would have to do the last two hundred miles as a swim, because he would strike the Atlantic Ocean at the twelve hundredth mile. But Brownlee just turned up his nose and sneered. He said Fluff was no fool, and that when he reached the coast he would veer to the north and travel along the beach for two hundred miles or so. Then Massett said that he had been thinking about Brownlee's theory, and he _knew_ no dog could do what Brownlee said Fluff would do--sixty miles an hour. He said he agreed that a dog like Fluff could do thirty miles an hour if he did not stop to howl, because his howl represented about sixty horse power, but that no dog could ever do sixty miles an hour. Then Brownlee got mad and said Massett was a born idiot, and that Fluff not only _could_ do sixty miles, but he could keep on increasing his speed at the rate of thirty miles per gun indefinitely. Then they went home mad, but they agreed to be on hand when Fluff returned. But they were not. Fluff came home in twenty-four hours, almost to the minute. When I went over and told Brownlee, he wouldn't believe it at first, but when I showed him Fluff, he cheered up and clapped me on the back.