 The Appendix to the Transcendental Dialectic is divided into two parts. In the first, “On the Regulative Use of the Ideas of Pure Reason,” Kant attempts to identify some proper “immanent” use for reason. In its most general terms, Kant is here concerned to establish a necessary role for reason’s principle of systematic unity. This principle was first formulated by Kant in the Introduction to the Transcendental Dialectic in two forms, one prescriptive, and the other in what sounded to be a metaphysical claim. In the first, prescriptive form, the principle enjoins us to “Find for the conditioned knowledge given through the understanding the unconditioned whereby its unity is brought to completion.” The complementary metaphysical principle assures us that the “unconditioned” is indeed given and there to be found. Taken together, these principles express reason’s interests in securing systematic unity of knowledge and bringing such knowledge to completion.