 Moving to linguistic terms and their association with ideas, the authors first take up the noun system. This is mostly drawn from Part II of the Port-Royal Grammar. As explained in Part II of the Logic, nouns are names of objects, that is, substances and attributes. Substantive nouns such as “earth” and “sun” signify substances, and adjectival nouns such as “good” and “just” signify attributes, “indicating at the same time the subject to which they apply…”. Just as substances are ontologically prior to their manners or modes, nouns are prior to adjectives in the structure of language. From the adjective one then creates a secondary substantive, an abstract noun: