"Many a singer far better than this absurd fop had been driven amid execration and abuse from the platform." Is the sentence that really shows mockery the best. While the author was praising him for what he was doing in the beginning it ends with such a mocking tone it changes the way you look at the rest of the reading.
So the reader can understand what is going on in greater detail so they can imagine what is going on in their heads. They use scientific language to show the subject of the book, science and to give the reader that same feeling
Both of the men are determined to “break” Douglass