“The End of Bovadium” (or called “The Bovadium Fragments”) was likely written in the last 1950s and early 1960s and follows on from Mr. Bliss as a comment on the use of automobiles. Humphrey Carpenter made brief reference to it in J.R.R. Tolkien: A Biography: “‘The Bovadium Fragments’ (perhaps composed early in the nineteen-sixties) is a parable of the destruction of Oxford (Bovadium) by the motores manufactured by the Daemon of Vaccipratum (a reference to Lord Nuffield and his motor-works at Cowley) which block the streets, asphyxiate the inhabitants, and finally explode.”
The Bovadium Fragments was not published during Tolkien’s life, and Clyde S. Kilby explained why: “It was full of the inventiveness to be expected of Tolkien. [.] I judged that it had two elements that would make it unpublishable. One was the more than liberal use of Latin, and the other the probability that a reader’s eye would focus on its playfulness rather than its serious implications. Actually it was an early comment on the commercialization of our world.” This story was not previously published due to Christopher Tolkien’s focus on his father’s writings set in Middle-earth and Arda.