Phaedrus, it seems, had high expectations for children's literary understanding. Or maybe, as A.A. Milne does in his Winnie the Pooh stories, he wanted to throw in a little something for the benefit of the adults who do the actual reading.
A Go-To Text for Latin III: Jenney’s 2nd Year Latin
And what, you may wonder, are the strongest features? Glad you asked. As is the case with the first book in this series, clarity and thoroughness are the strengths of Jenney's Second Year Latin.
A New Conception: Reading Latin
The Latin language is a little bit (just a little) like the alien language from the film. At least it is from the perspective of us speakers of Modern English.