I don't think I've ever written in a book. So many of the books I read are from libraries, or they're second-hand, perhaps very old, and I intend to pass them o

I don't think I've ever written in a book. So many of the books I read are from libraries, or they're second-hand, perhaps very old, and I intend to pass them on later, so I think of a book as a thing shared between many people who might not want to see each other's notes. Also, I've had to scan old books, when annotations were a nuisance. Also, I've received books that previously belonged to the author and scanned through them looking for corrections by the author, with a view to incorporating them into a posthumous new edition. It is tedious to turn 300 pages looking for a correction that perhaps isn't there. Writing in a book is an inefficient way of recording half a dozen notes or corrections relating to a 300-page book. Writing those notes on a slip of paper inserted into the book would be more efficient. I write on print-outs, of course. When the notes are sparse I make a mark in the corner of every page that I have written on so that I can quickly find those pages again.