 The Transcendental Deduction (A84–130, B116–169) is Kant’s attempt to demonstrate against empiricist psychological theory that certain a priori concepts correctly apply to objects featured in our experience. Dieter Henrich (1989) points out that Kant’s use of ‘Deduktion’ redeploys German legal vocabulary; in Holy Roman Empire Law, ‘Deduktion’ signifies an argument intended to yield a historical justification for the legitimacy of a property claim. In Kant’s derivative epistemological sense, a deduction is an argument that aims to justify the use of a concept, one that demonstrates that the concept correctly applies to objects. For Kant a concept is a priori just in case its source is the understanding of the subject and not sensory experience (A80/B106; Strawson 1966: 86). The specific a priori concepts whose applicability to objects of experience Kant aims to vindicate in the Transcendental Deduction are given in his Table of Categories (A80/B106); they are Unity, Plurality, and Totality (the Categories of Quantity); Reality, Negation, and Limitation (the Categories of Quality); Inherence and Subsistence, Causality and Dependence, and Community (the Categories of Relation), and Possibility-Impossibility, Existence-Nonexistence, Necessity-Contingency (the Categories of Modality).