- Volume 4, Introduction
- Volume 4, Chapter 1:- That squadron of Haworthias from Albertinia eastwards
- Volume 4, Chapter 2:- A glimpse of the super-species Haworthia nortieri
- Volume 4, Chapter 3:- More new things and ideas in Haworthia
- Volume 4, Chapter 4:- Some variation in Haworthia mirabilis var. sublineata
- Volume 4, Chapter 5:- What did I learn yesterday?
- Volume 4, Chapter 6:- Comments on Haworthia mortonii I.Breuer
- Volume 4, Chapter 7:- The brutality of the reality of Haworthia
- Volume 4, Chapter 8:- Closer to closure
- Volume 4, Chapter 9:- Closure
- Volume 4, Chapter 10:- Post-closure
- Volume 4, Chapter 11:- Haworthias – Small Relatives of Aloe
- Volume 4, Chapter 12:- Variation in Haworthia with Particular Reference to Haworthia Glauca, Baker
- Volume 4, Chapter 13:- Haworthia and Nomenclatural Confusion