Chapters 26-28, ordered and numbered by the author. The text includes inserted sheets (such as 865A) that are usually smaller than the main text (which is A4).
Chapter 26: 859-65, 865A, 866-81, 881A, 882-91.
Chapter 27: 892-905, 905A, 906-8, 908A-C, [908C2], 909-18.
Chapter 28: 919-33.