Ronald Weasley: "You know, I can't stand Snape - always there when you don't want him and setting impossible homework tasks to catch you out."
Hermione Granger: "Don't be so sure, Ron."
Ronald Weasley: "What?"
Hermione Granger: "While you were waiting for Harry, I was studying these books. I think we can get our hands on some fairy wings in Hogsmeade."
Hermione Granger and Ronald Weasley after one of Harry's Anti-Dementor lessons.[src]

These books belonged to Professor Cuthbert Binns, ghost and professor of History of Magic at Hogwarts School of Witchcraft and Wizardry. They were kept on large bookshelves in his room, Classroom 4F on the fourth floor of Hogwarts Castle.

During one of Harry Potter and Remus Lupin's private lessons, Hermione Granger studied the books and learnt that they could obtain Fairy wings for their Potions class at Hogsmeade, near the Shrieking Shack[1].


Notes and references