This work argues for self-sufficiency by describing a schoolboy who successfully calculates the remaining weight when one ounce is removed from five. At the start of this work, its author asks readers if they’d be able to avoid laughing at a painting of a horse's neck attached to a man’s head. This work claims (15[1])that “parts belonging to age may not be given to youth” to argue that older and younger characters should be written differently. This work coined a phrase translated as “from the (*) egg” to commend a different poet’s decision not to start an epic at the point when Leda gave birth to Helen. This letter is addressed to Lucius Calpurnicus Piso and his sons, and decries using a deus ex machina to resolve a literary work’s conflicts. For 10 points, name this epistle by Horace explaining how to write the title literary genre. ■END■ (0[4])