E. Nesbit, in The Book of Dragons, toward the end of the chapter titled 'The Island of the Nine Whirlpools', wrote:
The nine rubies were used afterwards in agriculture. You had only to throw them out into a field if you wanted it plowed. Then the whole surface of the land turned itself over in its anxiety to get rid of something so wicked, and in the morning the field was found to be plowed as thoroughly as any young man at Oxford. So the wicked King did some good after all.
This is a children's book, so I'm guessing "plowed as thoroughly as any young man at Oxford" doesn't mean what it implies to me. Edith Nesbit was English and she wrote this book in a fun / silly / dry witty style. What does she mean by this line?