The entire book is written in the target language. There is no English. No vocabulary lists to memorize by rote. No conjugation tables at the start of every chapter. Instead, you begin with simple sentences like "Roma in Italia est" (Rome is in Italy) and gradually, through marginal notes, illustrations, and repetitive sentence structures, you acquire grammar intuitively. The subtitle is crucial. De Lingua et Vita Romanorum means "Concerning the Language and Life of the Romans."
The book uses marginal notes—a picture of a man running next to the word currit (he runs). Before you look at the note, try to guess the meaning from context. This is how children learn their native language. via latina de lingua et vita romanorum pdf
Valete et bonam fortunam! (Goodbye and good luck!) The entire book is written in the target language