while kant's transcendental philosophy as expounded in the Critique of Pure Reason and the Prolegomena has been extraordinarily influential over the past two centuries, its transcendental methodology has continued to puzzle commentators. Recently, Colin Marshall, in an article entitled "Does Kant Demand Explanations for All Synthetic A Priori Claims?," has brought one of the central problems for any interpretation of Kant's methodology to the fore again.1 In his paper, Marshall discusses what he calls "the Regress Puzzle": Several commentators have noted (...) that there is a puzzle about how the positive part of Kant's project could work. The puzzle, which I will call the "Regress Puzzle," arises when we ask: If Kant... (shrink)