You can read the book for free on Huxley.net but I recommend you read it either off-screen or not on a web page.
It’s been demonstrated time and time again that people who can come up with incredible, fictional worlds that have something tangible to say about our own, have the ability to do so exactly because they understand this Earth and universe so well. Huxley was no exception, and his addendum to Brave New World is a beautifully lucid account of where his original work, written 25 years previously, had failed to anticipate the great emerging forces that were threatening freedom as Huxley perceived them at the time. This list of the book’s chapters might give you some idea of what those threats were:
II Quantity, Quality, Morality
IV Propaganda in a Democratic Society
V Propaganda Under a Dictatorship
VI The Arts of Selling
VIII Chemical Persuasion
IX Subconscious Persuasion
XI Education for Freedom
XII What Can Be Done?
I’m incredibly curious what Huxley would have to say about our 21st century society and where his hopes would lie today – whether he’d still think that
“meanwhile there is still some freedom left in the world. Many young people, it is true, do not seem to value freedom. But some of us still believe that, without freedom, human beings cannot become fully human and that freedom is therefore supremely valuable. Perhaps the forces that now menace freedom are too strong to be resisted for very long. It is still our duty to do whatever we can to resist them. “