What is the central theme of Chapter 34, and what specific story is introduced to demonstrate this theme?

Chapter 34 of the Shri Sai Satcharitra continues the theme from the previous chapter, focusing on the immense glory and healing power of Udi (sacred ash). The introduction explicitly states its purpose is to further narrate Udi's qualities. To illustrate this point, the chapter introduces the story of a doctor from Malegaon. As recounted in Chapter 34, this doctor's young nephew suffered from a terrible bone-cyst that was incurable by any conventional medical means. This narrative is presented as an experiential account to showcase Udi's miraculous ability to heal even the most difficult and extraordinary maladies, which serves as the central message of the chapter.