How is part iv different from the other parts of the story what is its purpose "the nose"?

Part IV shows the narrator's considerations about the story, while the other parts present the story itself.

Explanation:

"The nose" is a short story written by Nicholau Gogol that portrays the fantasy story of a nose that came out of its owner's face and took on a life of its own and decides to live independently. The short story is a satire and is divided into several parts.

Part IV proves to be the most different of all, since it counts on the narrator's considerations, the most "nosense" points of the narrative, while the other parts are summarized to tell the facts that compose the story itself.