structure?

The entire book is structured around the author's 4-month railroad trip through Europe and Asia. The book is divided into 30 chapters that run from 5 to 40 pages each. The first 3 chapters, pp. 1 to 56, describe the author's journey from London to Eastern Turkey, generally within what one would call the Western World. Chapters 4 to 7, pp. 57-90 recount the leg of the journey through Iran, Afghanistan and Pakistan. Chapters 8 to 16, pp. 91-178 are a large section of the book that tells of the author's journeys in India and Ceylon. Chapters 17 to 19, pp. 179-206 describe the author's side-trip to Burma with the goal of crossing the Gokteik Viaduct, in an area forbidden to tourists.