What story is used in Chapter 34 to demonstrate the power of Udi?

Chapter 34 of the Shri Sai Satcharitra illustrates the power of Udi through the story of a doctor's nephew from Malegaon. The young man was suffering from a terrible bone-cyst, an ailment that could not be cured by any medical intervention, including native, foreign, and surgical treatments attempted by expert physicians. As the chapter recounts, when all remedies failed, the family heard of Sai Baba in Shirdi. They brought the boy to Baba, who, as the embodiment of compassion, gave them Udi to smear on the wound, showcasing its miraculous healing properties even for incurable diseases.