Upon that, he pulled out a napkin, as if it were a magic clew without which he couldn’t find the way up stairs, and led us to the black hole of the establishment, fitted up with a diminishing mirror (quite a superfluous article, considering the hole’s proportions), an anchovy sauce-cruet, and somebody’s pattens.
There are no more uses of "superfluous" in the book.
Show samples from other sources
Eliminate superfluous words.
Everyone liked the idea. The arguments I prepared to support it were superfluous.