This second-revised edition of Crowley's magnum opus features new, more legible typesetting, text corrections based on a previously unseen corrected proof, and the previously unpublished Liber Testis Testitudinis.The original Book of the Law was re-scanned for this edition, using the latest technology, for the clearest facsimile possible. Edited, annotated, and introduced by Frater Hymenaeus Beta, XI.