'Paul Guyer has made a lasting mark on Kant scholarship with several ground-breaking books (such as his classic Kant and the Claims of Knowledge), and also with a significant number of substantive essays. This volume contains a selection of his most important essays that speak both to what is and to what is not living in Kant's theoretical philosophy. It is enormously helpful to have these essays collected together in one place, not simply for the ease of reference it provides but also because it helps one appreciate more fully Guyer's synoptic vision of Kant.' Eric Watkins, University of California, San Diego