The LXIVth Chapter is probably one of the oldest of all in the Book of the Dead, and two versions of it seem to have existed in the earliest times. The longer version is called the “Chapter of coming forth by day in the underworld,” and the shorter the “Chapter of knowing the ‘ Chapters of coming forth by day ’ in a single Chapter.” On a coffin of the Xlth dynasty both versions occur. The rubric of one version ascribes it to the reign of Semti-Hesep-ti, i.e., about b.c. 4266, while the rubric of the other attributes its discovery to the time of Menthu-hetep, which is clearly 211a mistake for Men-kau-Rā (Mycerinus). Thus in the XIth dynasty it was believed that the Chapter might even be as ancient as the time of the 1st dynasty. There is little doubt that the Chapter was looked upon as an abridgment of all the “Chapters of coming forth by day,” and that it had a value which was equivalent to them all.