Series II. Original Work contains typescripts and handwritten versions of Day's original work. This series includes early versions of the first three chapters of the book Quipus and Witches' Knots: the Role of the Knot in Primitive and Ancient Cultures contains, in addition to the completed manuscript with Day's edits and illustration. This series also contains handwritten and typed appendices of another of Day's works, Quipus Magic Knots and Surgeon's Slings. It is unclear if this was the start of another work, or if this was originally the name of some other work of Day's.