The five chapters which Quintilian has devoted to ‘Grammatica’ are in many ways the most valuable discussion of the subject which we possess. They are older than any other surviving account, except the remains of Varro De lingua Latino, and the grammar of Dionysius Thrax, and this last, though far more complete than Quintilian in its examination of the parts of speech, has nothing that compares with the other chapters on analogy, etymology, etc., nor does it give so clear a view of ‘grammatica’ as a whole. These chapters do not appear to have been treated by any scholar since Nettleship published his article on ‘Latin Grammar in the First Century’ in the Journal of Philology, vol. xv. If, in the course of this paper, I traverse on certain points the opinions of so distinguished a scholar, let it be understood that I do so with much diffidence, and only after much consideration of the facts as they appear to me.