Can you tell me the story from Chapter 34 about the doctor from Malegaon and his nephew?

Certainly. Chapter 34 recounts the story of a degree-holding doctor from Malegaon whose nephew was afflicted with a severe bone-cyst, also known as Hadyavarn. Despite the doctor himself being a physician and enlisting the help of his expert friends and even surgeons, no remedy, whether native or foreign, could cure the boy's ailment. After exhausting all medical options, the family heard of Sai Baba in Shirdi. They traveled to see him, and upon hearing their plea, Baba, the embodiment of compassion, gave them Udi and instructed them to smear it on the wound. The chapter's introduction states that this Udi from Sai's hand completely uprooted the pain from this terrible disease.