 In the Critique of Pure Reason Kant contemplates the possibility of a law that would govern the content of synthetic judgements. This law is supposed to be a complement to the principles of non-contradiction and excluded middle, which govern the logical form of both synthetic and analytic propositions. The law, which Kant terms “The Principle of Thoroughgoing Determinability” (Grundsatz der durchgaengigen Bestimmung), states that “of every pair of possible [and opposite] predicates, one of them must apply” to every single thing [A573/B601]. As a result, every single thing would be thoroughly determined with regard to any pair of opposite predicates. This law seems to necessitate the idea of the sum total of all possibility, and as a further result, the concept of an ens realismus. Kant argues, however, that this derivation is not valid insofar as it attempts to apply a principle that is limited to possible experience to all things (including things in themselves) [A583/B661]. Like Kant, Maimon too suggests a transcendental principle that will govern synthetic propositions with regard to their content and not their form (the latter being governed by the law of non-contradiction). In spite of these similarities, Maimon’s Law of Determinability (Satz der Bestimmbarkeit) is significantly different from the one offered by Kant. The two laws not only differ with regard to their contents, but they also serve different functions, and have different weight in the two systems. While the Kantian law has a relatively marginal place within his systems (and is considered by many scholars as a mere residue of the metaphysical inheritance of Baumgarten and Wolff), Maimon’s law seems to be the crucial axis of his positive philosophy.