What is the story about the hairball?

Huck, still quite worried over what is going to happen now that Pap has returned, goes to the Miss Watson's slave Jim for advice. Jim takes out a hair-ball in order to do some magic with it for Huck. When the hair-ball refuses to work properly, Jim suggest that Huck give it some money. Huck offers a counterfeit quarter, which Jim takes and places under the ball. Jim tells Huck that Pap is torn between two angels, a good white angel and a bad black angel. He also explains that Huck will have considerable pain in his life and at the same time considerable joy.