How is Jem changing in Chapter 4 of Harper Lee's To Kill a Mockingbird? Give several specific examples.

In Harper Lee's To Kill a
Mockingbird, Jem changes in two ways in Chapter Four. First of all, he starts
to become more protective of Scout. She gets home a half hour before he does. One day,
running home, Scout notices something in the hole of a tree: it is a stick of gum, which
she promptly puts in her mouth. When Jem arrives home and finds what she has done, he
makes her spit the gum out, and gargle, threatening to tell if she doesn't comply—which
she does.

Jem is also becoming more concerned about how he
looks in the eyes of his peers. When Dill comes to Maycomb for the summer, the talk of
"Hot Steams" arises (which is a old superstition about a fog that will kill you if you
walk through it). Scout makes fun of the idea which embarrasses Jem. Soon, he takes his
revenge by hurling the tire in which Scout is curled up (a game they play) as hard as
possible.

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Until it happened, I did not realize that Jem
was offended by my contradicting him on Hot Steams, and that he was patiently awaiting
an opportunity to reward me. He did, by pushing th tire down the sidewalk with all the
force in his body.

However,
even though Jem is angry with Scout, he still demonstrates concern for her safety when
the tire rolls into the Radley yard. He screams and hollers for her to get out. When she
does, he is mad that she did not bring the tire so she tells him to get it himself. He
is fearful, but doesn't want to look like a coward, so he
does.

In order to keep up the facade of his fearlessness of
the Radleys, Jem suggests that they play a new game called "The Radleys" where they
reenact the lives of the Radley family based on snippets of gossip and their
imaginations.

Jem is becoming more mature in his protection
of Scout, but he is also more concerned about how he appears to his peers, wanting to
seem grown-up and fearless.