What is the primary subject and story told in Chapter 34 of the Shri Sai Satcharitra?

Chapter 34 of the Shri Sai Satcharitra continues the discussion from the previous chapter on the glory and power of Udi, or sacred ash. The introduction establishes that the chapter will further describe Udi's qualities and characteristics. To do so, it narrates a powerful story as an illustration of its efficacy. As described in Chapter 34, the chapter details the case of a doctor's nephew from Malegaon who was suffering from a terrible bone-cyst, an ailment that no medical treatment, including surgery, could cure. The family, having exhausted all options, turns to Sai Baba as a last resort, leading to a demonstration of the Udi's healing power.