What is the primary topic and illustrative story presented in Chapter 34 of the Shri Sai Satcharitra?

According to the source material for Chapter 34, the chapter serves as a continuation of the previous one, further exploring the glory and majesty of Udi. The introduction explicitly states that the narration describes Udi's qualities and characteristics. To illustrate its power, the chapter presents a story based on experience about a doctor from Malegaon. This doctor's nephew was afflicted with a terrible bone-cyst, or Hadyavran, which proved incurable by any medical remedy. The story follows the family's journey to Shirdi to seek help from Sai Baba, highlighting the healing power of his Udi when all other methods had failed.