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In a small locked tower, never visited by any student at Hogwarts, sits an ancient book that has not been touched by human hands since the four founders placed it there on completion of the castle. Beside the book, which is bound in peeling black dragon-hide, stands a small silver inkpot and from this protrudes a long, faded quill. These are the Quill of Acceptance and the Book of Admittance and they constitute the only process by which students are selected for Hogwarts School of Witchcraft and Wizardry.

At the precise moment that a child first exhibits signs of magic, the Quill, which is believed to have been taken from an Augurey, floats up out of its inkpot and attempts to inscribe the name of that child upon the pages of the Book (Augurey feathers are known to repel ink and the inkpot is empty; nobody has ever managed to analyse precisely what the silvery fluid flowing from the enchanted Quill is).

Those few who have observed the process (several headmasters and headmistresses have enjoyed spending quiet hours in the Book and Quill’s tower, hoping to catch them in action) agree that the Quill might be judged more lenient than the Book. A mere whiff of magic suffices for the Quill. The Book, however, will often snap shut, refusing to be written upon until it receives sufficiently dramatic evidence of magical ability.

In fact, the Book’s sternness has a purpose: its track record in keeping Squibs out of Hogwarts is perfect. Non-magic children born to witches and wizards occasionally have some small, residual aura of magic about them due to their parents, but once their parents’ magic has worn off them it becomes clear that they will never have the ability to perform spells. The Quill’s sensitivity, coupled with the Book’s implacability, have never yet made a mistake.

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