London: Rider & Co., 1929. First Edition. Octavo, 255 pages, publisher's original pictorial dust jacket. Publisher's original gilt-lettered blue cloth covered boards. Illustrated with black-and-white plates. Dust jacket now in protective mylar. A scarce collection of previously unpublished letters by Helena Petrovna Blavatsky, the Russian-born occultist, author of Isis Unveiled.....