Several years ago, Ian Hacking wrote a fascinating book called The Emergence of Probability (1975). It deals with several important issues in the history of epistemology and breaks new ground in its treatment of most of them. But in one crucial respect, Hacking's analysis restates a certain pervasive philosophical myth. More than restating the myth, Hacking gives it as forceful an expression as one finds in the literature. That myth, closely related to the purist model I described in Chapter 2, concerns David Hume and the so-called problem of induction.