De analogia

De analogia (full title: De analogia libri II ad M. Tullium Ciceronem, "Two Books on Analogies, [dedicated] to Marcus Tullius Cicero") is a lost book in two volumes of grammatical work on the Latin language written by Julius Caesar and dedicated to Cicero. Only a few fragments from this important work have survived. Suetonius mentions that Caesar wrote De analogia while he and his army were crossing the Alps.