 Oliver Wendell Holmes, Jr. (1861) remarked that “Revolutions never follow precedents nor furnish them.” Given the unpredictability, the nonlinearity, the seeming uniqueness of revolutions, whether political or scientific, it is therefore surprising to find Thomas Kuhn attempting to provide a General Theory of Scientific Revolutions (Kindi 2005). Early Kuhn did seem to believe that there is a single, underlying pattern to the development of mature sciences that is key to their success, and late Kuhn a different pattern. Has either early or late Kuhn found such a pattern, or has he imposed his own philosophical structure on the vagaries and vicissitudes of history? Kuhn’s Kantianism always did live in tension with his historicism, and in his late work (e.g., 2000c) he surprisingly gave up the pretense of deriving his pattern of taxonomic change and speciation from history of science, on the ground that it largely followed “from first principles.”