Huck and Jim build a shelter for Jim on their raft for Jim to hide in when other boats come near them. When this actually happens Huck tells the boatmen that his very sick father,who is suffering from Smallpox is sleeping there. The men are afraid and leave as fast as they can. On the same day Jim and Huck lose each other when a river steamboat colides with their raft and sinks. (thetvdb.com)