The Commens Dictionary
Quote from ‘The Branches of Geometry; Existential Graphs [R]’
We certainly have the notion of objective possibility, whether there be such a thing or not. It may be defined as that mode of being which is not subject to the principle of contradiction since if it be merely possible that A is B, it is possible that A is not B. [—] How can the principle of contradiction fail to apply to anything? By something being held in reserve and not expressed.
MS [R] 96
‘Possibility’ (pub. 24.11.15-16:23). 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-branches-geometry-existential-graphs-r.