Didascalicon, Book II: the sciences, their parts and their discipline
Chapter XXX. On the division of grammar
Grammar is divided into letter, syllable, word and sentence; or otherwise grammar is divided into letters, that is into what is written, and vowels, that is into what is pronounced; or otherwise: Grammar is divided into noun, verb, participle, pronoun, adverb, preposition, conjunction and interjection; into articulate voice, letter, syllable, feet, accents, positions, marks, orthography, analogy, etymology, glosses, barbarism, solecism, faults, metaplasms, schemes, tropes, prose, meters, fables, histories. I pass over the exposition of these because it would be more prolix than the brevity of this little work demands, and because in this opusculum I have proposed to investigate only the divisions and names of things, that only a certain beginning of doctrine might be laid up for the reader. Whoever desires to know more, let him read Donatus, Servius, Priscian on the accents and on the twelve verses of Virgil, and the Barbarismus, and Isidore in the books of the Etymologies.