H. P. Blavatsky

Per‐M‐Rhu. This name is the recognised pronunciation of the ancient title of the collection of mystical lectures, called in English The Book of the Dead. Several almost complete papyri have been found, and there are numberless extant copies of portions of the work. [w.w.w.]

Source: H. P. Blavatsky, The Theosophical Glossary, art. Per‐M‐Rhu