he range of Huxley's interests can be seen from his note that his "preliminary research" for Island included "Greek history, Polynesian anthropology, translations from Sanskrit and Chinese of Buddhist texts, scientific papers on pharmacology, neurophysiology, psychology and education, together with novels, poems, critical essays, travel books, political commentaries and conversations with all kinds of people, from philosophers to actresses, from patients in mental hospitals to tycoons in Rolls-Royces...." He used similar, though probably fewer, sources for Brave New World.
In 1958, he published Brave New World Revisited, a set of essays on real-life problems and ideas you'll find in the novel--overpopulation, overorganization, and psychological techniques from salesmanship to hypnopaedia, or sleep-teaching.
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Other critics objected that he was a better essayist than novelist precisely because he cared more about his ideas than about plot or characters, and his novels' ideas often get in the way of the story. ut Huxley's emphasis on ideas and his skin as an essayist cannot hide one important fact: The books he wrote that are most read and best remembered today are all novels--Crome Yellow, Antic Hay, and Point Counter Point from the 1920s, Brave New World and After Many a Summer Dies the Swan from the 1930s.