Book 1
4.18
Earlier writers, among them Aristotle himself and Theodectes, hold that there are but three, verbs, nouns and convictions. Their view was that the force of language resided in the verbs, and the matter in the nouns (for the one is what we speak, the other that which we speak about), while the duty of the convinctions was to provide a link between the nouns and the verbs. I know that conjunction is the term in general use. But conviction seems to me to be the more accurate translation of the Greek .
4.19
Gradually the number was increased by the philosophers, more especially by the Stoics: articles were first added to the convinctions, then prepositions: to nouns appellations were added, then the pronoun and finally the participle, which holds a middle position between the verb and the noun. To the verb itself was added the adverb. Our own language dispenses with the articles, which are therefore distributed among the other parts of speech.
