I am always torn on whether to write in my books or not (printed books, obviously, no journals or the like).

The bibliophile in me recoils at the idea, and instead gets a nice neat notebook, marks down the page and makes the note (ie: "Magus, p213: Uriel is AVRYAL in Hebrew, possibly carve this in paleo-Hebrew?"). But invariably I lose that notebook or forget which notebook I used years later and I'm back to square one with a clean book.

The aesthetic enthusiast in me loves the look of a written in book (ie: the Half-blood Princes textbook in Harry Potter). http://img2.wikia.nocookie.net/__cb20150115071854/harrypotter/images/0/05/Advanced_Potion_Making_pages.png This also apeals to the practical part of me which says then those notes will always be with that book.

What do you all do?