This book has text and analysis of a key Egyptian ritual which was performed when preparing the corpse of a pharaoh for mummification. This is known as the "Book of the Opening of the Mouth". The ritual consisted of offering a long sequence of foodstuffs, beverages, cosmetics and other consumables, along with a litany recited by the priests. This text was also painted on the walls of the royal tomb. This recitation may be tedious and repetitous, but there is a reason that I've gone to the trouble of creating an etext of this book. Although Budge doesn't emphasize this, this text comprises an important part of the 'Pyramid Texts', of which only portions are available in public domain English translation.
