antique book with writing in book

I have this book. Shakespeare's Tragedy of Othello edited by William J Rolfe. It has two copyright dates of 1879 & 1898. There is writing on a lot of the pages with tracing paper like inserts with writing on them also. I also found a hand written letter in the book with Alma Hutchings Brookline Ma on the stationary. I am curious what the book was used for and why there is so much writing on the pages. And worth.