Pinkerton's History of Scotland

https://play.google.com/store/books/details/John_Pinkerton_The_History_Of_Scotland_From_The_Ac?id=0dI_AAAAcAAJ  This book has an appendix of letters in the back that Mary Shelley makes reference to in the preface to her novel on Perkin which is beside me right now. These letter s she asserts, contain some sort it f evidence about the boys in the Tower. That is the significance of novel. I have a hard to time reading it.