After the performance one evening at Richmond, Barnum tried to pay Turner for that practical joke about the Rev. Mr. Avery. A score of the company were telling stories and singing songs in the sitting room of the hotel. Presently somebody began propounding some amusing arithmetical problems. Then Turner proposed one, which was readily solved. Barnum's turn came next, and he offered the following, for Turner's especial benefit: "Suppose a man is thirty years of age, and he has a child one year of age; he is thirty times older than his child. When the child is thirty years old, the father, being sixty, is only twice as old as his child. When the child is sixty the father is ninety, and therefore only one-third older than the child. When the child is ninety the father is one hundred and twenty, and therefore only one-fourth older than the child. Thus you see, the child is gradually but surely gaining on the parent, and as he certainly continues to come nearer and nearer, in time he must overtake him. The question therefore is, suppose it was possible for them to live long enough, how old would the father be when the child overtook him and became of the same age?" The company generally saw the catch; but Turner was very much interested in the problem, and although he admitted he knew nothing about arithmetic, he was convinced that as the son was gradually gaining on the father he must reach him if there was time enough--say, a thousand years, or so--for the race. But an old gentleman gravely remarked that the idea of a son becoming as old as his father while both were living, was simply nonsense, and he offered to bet a dozen of champagne that the thing was impossible, even "in figures." Turner, who was a betting man, and who thought the problem might be proved, accepted the wager; but he was soon convinced that however much the boy might relatively gain upon his father, there would always be thirty years difference in their ages. The champagne cost him $25, and he failed to see the fun of Barnum's arithmetic, though at last he acknowledged that it was a fair offset to the Avery trick.