Flashback to the end of the last chapter: Toby and Mr. Shandy are standing. At long last, they take a seat. Toby sends off for his book by Stevinus, the engineer he was trying to explain in Chapter XII.
Dr. Slop and Toby bicker good-naturedly about German geography and engineering. Toby brings up a curious invention, a "sailing chariot" that's propelled by wind.
Dr. Slop thinks that the sailing chariot would be a great thing for England, since, unlike horses, it doesn't cost money. Mr. Shandy points out that the economy depends on consumption and trade, and he seems about to start into a very useful dissertation when—