The Commens Dictionary
Quote from ‘Division III. Substantial Study of Logic. Chapter VI. The Essence of Reasoning’
That is essentially or logically possible which a person who knows no facts, though perfectly au fait at reasoning and well-acquainted with the words involved, is unable to pronounce untrue.
MS 409:106; CP 4.67
‘Essential Possibility’ (pub. 06.03.18-16:15). 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-9.