One of the most celebrated of all his books is his translation of "The Book of the Thousand Nights and a Night" (commonly called "The Arabian Nights" in English after early translations of Antoine Galland's French version) in ten volumes (1885), with seven further volumes being added later. The volumes were printed by the Kama Shastra Society in a subscribers-only edition of one thousand with a guarantee that there would never be a larger printing of the books in this form. The stories collected were often sexual in content and were considered pornography at the time of publication. In particular, the "Terminal Essay" in volume 10 of the "Nights" contained a 14,000-word essay entitled "Pederasty" (Volume 10, section IV, D), at the time a synonym for homosexuality (as it still is, in modern French). This was and remained for many years the longest and most explicit discussion of homosexuality in any language. Burton speculated that male homosexuality was prevalent in an area of the southern latitudes named by him the "Sotadic zone".