The Commens Dictionary
Quote from ‘How to Reason: A Critick of Arguments. Advertisement’
…in all reasoning there must be something amounting to a diagram before the mind’s eye, and […] the act of inference consists in observing a relation between parts of that diagram that had not entered into the design of its construction.
MS [R] 397:2
‘Reasoning’ (pub. 22.08.15-10:44). 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-how-reason-critick-arguments-advertisement.