It is well known that J.R.R. Tolkien published The Hobbit in 1937 and The Lord of the Rings in 1954-5. What may be less known is that he continued to write about Middle-earth in the decades that followed, right up until the years before his death in 1973. For him, Middle-earth was part of an entire world to be explored, and the writings in The Nature of Middle-earth reveal the journeys that he took as he sought to better understand his unique creation....