I don't remember which chapter or page its in but i'm trying to find it.
It's a quote that tells how Winston puts his hair in the notebook before he leaves, cuz someone might come into his house. If the hair disappears, that proves that a thought police or somebody came into his house and noticed that he has a diary.
Answer on 1984 novel quotes???????
This is the quote -
"He put the diary away in the drawer. It was quite useless to think of hiding it, but he could at least make sure whether or not its existence had been discovered. A hair laid across the page-ends was too obvious. With the tip of his finger he picked up an identifiable grain of whitish dust and deposited it on the corner of the cover, where it was bound to be shaken off if the book was moved."