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

The primary message of Chapter 34 is the extraordinary healing power and glory of Sai Baba's Udi. This chapter continues the narration from the previous one, illustrating how faith in Baba and the application of his Udi can cure ailments that are beyond the scope of medical science. The central story used to convey this message is that of a doctor's nephew from Malegaon. As detailed in Chapter 34, the boy suffered from a severe bone-cyst (Hadyavran) that baffled all expert physicians and surgeons. After all native and foreign treatments failed, the family, in desperation, turned to Sai Baba. He compassionately gave them Udi to apply to the wound, providing reassurance and ultimately demonstrating the Udi's miraculous power.