This article examines the business of three United States Courts of Appeals over the course of their history. The courts selected for study were the northeastern Second Circuit, the deep south Fifth Circuit, and the west coast Ninth Circuit. A random sample of 50 cases was drawn for each circuit for every fifth fiscal year beginning with 1895 and ending with 1975. The sample years were aggregated into four time periods: 1895-1910, 1915-1930, 1935-1955, and 1960-1975. The business of the three circuits was found to have changed substantially from the 1895-1910 time period to the modern period. In the earlier years the circuits had small proportions of criminal cases—with the exception of the Second Circuit—a significant portion of real property cases, substantial proportions of business cases, and significant proportions of tort cases. By the 1960-1975 period a sizable proportion of the business of all three circuits was devoted to criminal and other public-law type cases; there were negligible proportions of real property cases, relatively small proportions of business cases, and even smaller proportions of tort cases. Public disputes replaced private disputes as the major source of the courts' business, and over time there has been a convergence among the circuits in the mix of cases coming to them.