Categories and Logical Forms in Kant’s Metaphysical Deduction

Abstract

Compared with the other sections of Kant's Critique of Pure Reason, the Metaphysical Deduction is among the most obscure and it seems that the section has not received as much critical and interpretive attention as its cousin, the Transcendental Deduction. This is rather surprising because it is at the Metaphysical Deduction that Kant crucial in establishing his program of justifying empirical knowledge in the face of radical skepticism. It is argued in this paper that the connection between the two types of logic is as follows: the logical forms, which belong to formal logic, are the ratio cognoscendi of the Pure Concepts of Understanding, since they provide the key to knowing the latter. On the other hand, the categories are the ratio essendi of the Logical forms, for it is the former that are the condition of the possibility of the latter.