Australia is responsible for a tenth of all British trade yet its population counts for four million of the emoire's 400 million people.  Twain takes a 17 hour train ride from Melbourne to Adelaide.  He meets a judge traveling from Sydney to Broken Hill, both in New South Wales. Although the towns are but 700 miles apart, the judge travels 2000 miles, through Victoria and South Australia, to get there.  Mark Twain is amazed at the tracking skills of the Australian aborigines.