Cast

the petrol^✦︎ and Sir Roderick Glossop

• Sir Roderick Glossop wants the petrol chapters 16, 17

They deal with each other in Thank You, Jeeves 16, 17.

Every dealing, in order

• Chapter 16Sir Roderick Glossop means to clean himself with the petrol
• Chapter 17Sir Roderick Glossop went to clean himself with the petrol (earlier)