The Commens Dictionary
Quote from ‘Reason's Rules’
The possible is that which in a given state of information is not known not to be true.
MS [R] 599:36
‘Possibility’ (pub. 14.08.17-14:26). 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-reasons-rules-13.