I have the Norton Critical Edition which is also divided into 3 volumes with each volume beginning with chapter one. Starting with chapter one in volume 2, I have just penciled in 24 next to it and so on to the end. Just makes life easier, not only in following the reading schedule, but when referring to chapters when mentioned in the posts or when I want to mention them in my own posts. Of course, if the book is not yours that's another thing. :)