The Code of the Woosters, chapter 10, the passage, same evening
Bertie finds Spode battering Gussie's door, cows him, and takes from him the notebook he found in the cow-creamer, then hands it to Gussie to show Madeline.
The text is on its way.
Aside, earlier, as told by Jeeves Bertie pictures Archimedes in his bath discovering the principle of displacement.
Present: Bertie Wooster, Gussie Fink-Nottle, Roderick Spode
Also there: Gussie's notebook
Mentioned: Archimedes, Jeeves, Madeline Bassett, Sir Watkyn Bassett, Stiffy Byng, the collection-room, the cow-creamer✦︎, Gussie's room