From the following context clues, determine what definition of "residuum" Emerson is using.
The last chamber, the last closet, he must feel was never opened; there is always a residuum unknown, unanalyzable. That is, every man believes that he has a greater possibility.
—Ralph Waldo Emerson, from "Circles"
Hint: The following all correctly define "residuum" Think connotation.
that which remains; a residue
applied to persons of the lowest class
a waste or residual product