Abstract

The aim of this article is to show that the scholastic commentaries on the Predicables or Categorems (in Porphiry Eisagoge) constituted a style of treatises on the philosophy of language and philosophy of logic. In such studies, called afterwards “Material Logic”, is considered, for instance, the theme of the domain of logic and the possibility of its construction; furthermore, logic is relates to ontology through the problem of universals. Here is explored to logical being (ens rationis) which is the objectum (subject) of this discipline, and is analized the structure of proposition and the nature of the main constitutives of inference. In the side of Philosophy of Language are located the study of the meaning of subjects and predicates (or predicables), that of the proposition formed by them, also a hierarchy of logical types (and semantical ones), and the principles of the ordained disposition of natural kinds and other classifications. They are things that now attract the interest of philosophers of logic and philosophers of languagewithin the analytic tradition