The interest felt in a novel . . . The interest excited by poetry comes from the representation of feeling. That which is eloquent aims primarily to achieve a desired effect on other people. Mill begins his search for a definition of what poetry is by telling us what it is not . But, Mill says, poetry isn't the only thing which acts on the emotions.
Novelists work to make an emotional impression on readers just as poets do.
Mill calls these the appeals of poetry and of eloquence.