There were three recensions or versions of the _Book of the Dead_--the Heliopolitan, the Theban, and the Saïte. The Heliopolitan Recension was edited by the priests of the College of Anu, or On, known to the Greeks as Heliopolis, and was based upon texts not now recoverable. The Pyramids of Unas, Teta, and Pepi contain the original texts of this recension, which represent the theological system introduced by the priests of Ra. The essentials of the primitive Egyptian religion are, however, retained, the only modification in them being the introduction of the solar doctrine of Ra. In later times the priesthood of Ra were forced to acknowledge the supremacy of Osiris, and this theological defeat is visible in the more modern texts. Between the Sixth and Eleventh Dynasties the priests of On edited a number of fresh chapters from time to time. The Theban Recension was much in vogue from the Eighteenth to the Twenty-second Dynasties, and was usually written upon papyri and painted upon coffins in hieroglyphs. Each chapter was preserved distinct from the others, but appears to have had no distinct place in the entire collection. The Saïte Recension was definitely arranged at some date prior to the Twenty-sixth Dynasty, and is written upon coffins and papyri, and also in hieratic and demotic script. It continued to be employed to the end of the Ptolemaic period. As we have previously noticed, the _Book of the Dead_ was for their use from the moment when they found themselves inhabitants of the otherworld. Magic was the very mainspring of existence in that sphere, and unless a spirit was acquainted with the formulæ which compelled the respect of the various gods and demons, and even of inanimate objects, it was helpless. The region to which the dead departed the primitive Egyptians called Duat. They believed it to be formed of the body of Osiris. It was regarded as dark and gloomy, containing pits of fire and dreadful monsters which circled the earth, and was in its turn bounded by a river and a lofty chain of mountains. The part of it that was nearest to Egypt was regarded as a description of mingled desert and forest, through which the soul of the deceased might not hope to struggle unless guided by some benevolent spirit who knew the paths through this country of despair. Thick darkness covered everything, and under veil of this the hideous inhabitants of the place practised all sorts of hostility to the new-comer, unless by the use of words of power he could prove his superiority over them. But there was one delectable part in this horrid region--the Sekhet Hetepet, the Elysian fields which contained the Sekhet Aaru, or the Field of Reeds, where dwelt the god Osiris and his company. At first he had domain over this part of the Duat alone, but gradually he succeeded in extending it over the entire country of the dead, of which he was monarch. We find also a god of the Duat named Duati, but who appears to have been more a personification of