How does Kino and his behavior change throughout The Pearl?

It is clear that
throughout the novella Kino
changes greatly thanks to the introduction of the pearl into his
life. He
starts off as your average hard-working Mexican fisherman, desperately trying
to
provide for his wife and son and battling against poverty and
discrimination to succeed in this
goal.

However, with the
advent of the pearl into their lives, which should
have been a blessing, it
is clear that evil only comes. The pearl's malign influence distorts
Kino's
perceptions of reality and causes him to become absolutely fixated on getting the
right
price for the pearl so that he can allow his son to break out of the
poverty trap that has
dominated these lives. Pursuing this goal, however,
causes him to change. Note what he says to
his wife when she insists that the
pearl is evil:

And as
she spoke the
light came back in Kino's eyes so that they glowed fiercely and his muscles

hardened and his will hardened.

His face
becomes
"crafty" when he thinks of what he must do to sell the pearl. In the
next chapter,
when Juana tries to dispose of the pearl, he hisses at her
"like a snake" with bared
teeth, hitting her. However, perhaps most
chillingly, in spite of all of these transformations,
is what Kino says at
the end of chapter five:

"This
pearl
has become my soul," said Kino. "If I give it up I shall lose my

soul."

We see here the way that Kino's life
has
become completely dominated and obsessed with the pearl. He links it
inextricably to his soul,
indicating the malign influence that the pearl is
having on him. Of course, with such an
influence, only ais able to break it,
and the death of his son gives Kino the strength he needs
to return the pearl
to the sea from whence it emerged.