Esoteric Buddhism is a book originally published in 1883 in London; it was compiled by a member of the Theosophical Society, A. P. Sinnett. It was one of the first books written for the purpose of explaining theosophy to the general public, and was "made up of the author's correspondence with an Indian mystic." It "disseminated the basic teachings of Theosophy in its new Asian cast." (Wikipedia)