~~ “Hello, Bugs!” Ad said. “Hello!” Bugs answered. It was a negro’s voice. Nick knew from the way he walked that he was a negro. ~~
In this part of the book, Hemingway uses a little bit of racism. He is telling us someone is black just by the way he walks. Even though the racism is present here, the black guy is taking care of the white guy, who is obviously crazy. So, the black guy is being presented to the reader awkwardly, but he comes out to be a nice fellow.