His works and letters extensively criticised colonial policies of the British Empire, even to the detriment of his career. Although he aborted his university studies, he became a prolific and erudite author and wrote numerous books and scholarly articles about subjects including human behaviour, travel, falconry, fencing, sexual practices, and ethnography. A characteristic feature of his books is the copious footnotes and appendices containing remarkable observations and information. William Henry Wilkins wrote: "So far as I can gather from all I have learned, the chief value of Burton’s version of "The Scented Garden" lay not so much in his translation of the text, though that of course was admirably done, as in the copious notes and explanations which he had gathered together for the purpose of annotating the book. He had made this subject a study of years. For the notes of the book alone he had been collecting material for thirty years, though his actual translation of it only took him eighteen months."