The Commens Dictionary
Quote from ‘The First Part of An Apology for Pragmaticism’
In a paper published in the Proceedings of the American Academy of Arts and Sciences for 1867 May 14, I defined the three ways in which an idea can be mentally isolated from another. They [are] Dissociation, Prescission, and Discrimination. [—] Prescission consists in logically supposing a case in which the former idea is present but the latter not so. Thus we can prescind space from color since we can suppose a space between two objects to be uncolored, although we cannot visually dissociate space from color, since we must imagine every uncolored space to be surrounded with colored objects, if we imagine it visually.