Grammar is an experimental knowledge of the usages of languages as generally current among poets and prose writers. It is divided into six parts: (1) trained reading with due regard to prosody [versification]; (2) exposition, according to poetic figures [rhetoric]; (3) ready statement of dialectical peculiarities and allusion; (4) discovery of etymologies; (5) the accurate account of analogies; (6) criticism of poetical productions which is the noblest part of grammatical art.