Jem is maturing physically, beginning with his onset of puberty that occurs in Part Two of To Kill a Mockingbird. Calpurnia tells Scout that it's just about time to start calling him "Mister Jem," and that she can't help it if "he's growin' up." In Chapter 23, Jem proudly shows Scout his first wisp of chest hair; even though Scout "didn't see anything," she tells him "It's real nice, Jem." Although he doesn't display it, Jem tells Scout that he has hair under his arms, too, and that he plans to play football in the fall when he enters the seventh grade--his first year of high school. He doesn't make the football team, but he does serve as the water boy. Later that fall, Atticus shows his trust in Jem by allowing him to escort Scout to the Halloween pageant, and he displays his courage later that night by defending Scout against the attack by Bob Ewell.
Scout finally exhibits a willingness to become a lady at the Missionary Circle meeting. She bites her lip and remains silent when Miss Stephanie makes several jokes at her expense; and later, when Aunt Alexandra and Miss Maudie learn of Tom's death, she follows their lead when they regain their composure and go on about their duties as if nothing has happened. Scout admits to no longer believing in Haints and Hot Steams during her walk to the pageant, and later that night, she bravely recalls the events of the attack by Bob Ewell.