The Commens Dictionary
Quote from ‘Division III. Substantial Study of Logic. Chapter VI. The Essence of Reasoning’
Because every speech must contain two elements one indicative, the other symbolic, there is a logical foundation for the separation of a proposition into a subject and predicate. The subject is the part containing the indicative constituent, and from which it cannot conveniently be detached, while the predicate is the part purely symbolic.
MS [R] 409:96
‘Predicate’ (pub. 06.03.18-15:14). 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-division-iii-substantial-study-logic-chapter-vi-essence-reasoning-6.