How does thoreau describe his reasons for moving to the woods in lines 26–40? how do these lines relate to his purpose in writing walden?

The finishing point constructed by Twain is: when the old man is about to finish the story of Jim Smiley's jumping frog, another individual interrupts him. The narrator tries to leave the place, but the old man reaches it. The story ends with the old man who starts telling the narrator about a yellow cow with only one eye of Jim Smiley.