describe the authors style of writing in three men in a boat ?

Jerome's digressions (many adventures) allow him to broaden the scope of a novel that would otherwise be tightly focused on a single journey from London to Oxford and back. By giving J. a highly digressive narrative style, Jerome allows himself to write comically about topics that would otherwise be difficult to address in a travelogue. The digressions also characterize George, Harris, and J. by providing flashbacks about their lives before the trip. Finally, while the digressions have inspired criticisms about the novel's wandering style, they also define that style as truly singular, one which attempts to deliver a larger message about human nature and happiness through myriad approaches.