The Commens Dictionary
Quote from ‘The Art of Reasoning. Chapter I. What Is a Sign?’
Those [relations] that are most real are forces (in the general sense of that word); others, less real, are mere comparative qualities, or, to use a single word, ratios. Let us call a thing considered as one of a pair, a relate. When the relation is a force, the relates may be called reagents; when the relation is a ratio, the relates may be called terms.
MS [R] 796
‘Reagent’ (pub. 06.03.18-14:12). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-art-reasoning-chapter-i-what-sign.