The Principles of Newspeak (1949)
This appendix, along with the chapters that are except from "The Theory and Practice of Oligarchical Collectivism", are actually my favorite parts of 1984. I enjoyed how "Principals of Newspeak" is written in a past tense when describing the language and the events of year 1984, it feels like a glimmer of hope that somehow mankind did indeed escape the horrific dystopian world otherwise presented in the book.