This paper discuss the relations between the transcendental analysis of Kantian's Ideas of Reason (specially the Idea of Unity) and the traditional Metaphysical heritage. We try to understand the first Part of the Apendix Transcendental Dialectics under the light of critical remaking of the metaphysical themes, with special accent on the scholastic notion of "Transcendental atribute of Being".
Critic; metaphysic; transcendental; unity; logic; ontology