What request does Atticus make of Jem regarding Mrs. Dubose? What reason does he give Jem for keeping his temper with Mrs. Dubois?

Atticus comes home carrying green camellia buds and Scout's broken baton. He makes Jem go to Mrs. Dubose's house and apologize to her in person. Scout and Atticus discuss the necessity of keeping one's head even when times get hard. Atticus explains that he has to follow his conscience, no matter what anyone else in the town says. Jem returns from Mrs. Dubose's house. Atticus tells him one can't hold a sick old lady responsible for what she says.