The purpose of the chapter on faṣl and waṣl is not to memorize a list of places with and without wāw. Its object is to interpret the unity, independence, implied dialogue, affinity and circumstantial linkage of clauses. The discussion of nominal circumstantial sentences completes this line of inquiry.
A new chapter, al-ījāz wa-l-iṭnāb wa-l-musāwāh, begins on printed page 518. It concerns the relationship between the amount of wording and the intended meaning, and the communicative appropriateness of brevity, expansion and balanced expression. That chapter is intentionally reserved for the next level.