Where in Lord of the Flies does the author explain Ralph's traits?

In chapter one of Lord of the Flies,
there is a physical description of Ralph. The author begins by calling Ralph fair with
fair hair. Another description states that Ralph is about twelve years old. He has lost
his childhood tummy. He has an athletic build with wide shoulders. He has a "mildness
about his mouth and eyes that proclaimed no devil." This indicates a positive attitude
which is needed to lead well.

Later in chapter one,
additional details are added to Ralph's appearance and characteristics. He is described
as having a "stillness" about him and "there was his size, and attractive
appearance...." This calmness will help Ralph
lead.

Clearly, Ralph has the physical appearance of being
strong and athletic:

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You could see now that he might make a boxer, as
far as width and heaviness of shoulders
went..."

Golding seems to
think that Ralph would make a good leader. In fact, he writes that "only Ralph seems
remotely suited for his position." Immediately after being elected, Ralph assigns Jack
to the leadership of the choir. In this way, Jack will not take the election loss so
seriously:

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[Ralph] understates Jack’s election defeat with
an appointment to leader of the hunters.... In this manner, Golding highlights Ralph’s
inherent leadership
ability.

Ralph seems to be
born to lead. He exhibits caring qualities about the boys by providing shelters. He
proves his determination for all of them being rescued by his insistence on keeping the
fire going. Ralph is balanced in his leadership although he may not fully understand
why:

Ralph
understands leadership naturally, but is unable to perceive why. He does not, for
instance, know why they should take names, but he knows they should. He does not know
why he should not apologize to Piggy for the name incident, but he knows he should
placate him. Like a true leader, Ralph naturally and instinctively maintains both a
closeness to and distance from his
subordinates.

These traits
make him a good leader.

By the end of the novel, Ralph
shows a side that has been burdened with responsibility of leadership. He has carried
the weight on his shoulders. When he runs into the naval officer, he breaks down and
sobs:

Ralph
wept for the end of innocence, the darkness of man's heart, and the fall through the air
of the true, wise friend called
Piggy.