How is Jim introduced in Huckleberry Finn?

In chapter two, Huck slips out of the widow's house with Tom Sawyer late at night. Jim is in the kitchen and almost catches them when he hears a twig snap as they try to slip by. But Huck and Tom hide in the dark. Jim sits down to listen and see if he can catch whoever is prowling around. He falls asleep, and Tom slips his hat off and hangs it from a tree branch.