The Commens Dictionary

Quote from ‘A Sketch of Logical Critics’


By “Reasoning” shall here be meant any change in thought that results in an appeal for some measure and kind of assent to the truth of a proposition called the “Conclusion” of the reasoning, as being rendered “Reasonable” by an already existing cognition (usually complex) whose propositional formulation shall be termed the “Copulate Premiss” of the reasoning. The reader will remark, as the point where this definition most markedly breaks with actual usage, that it refuses the name of reasoning to the synthesis into one recognition of the major and minor premises of a syllogism.

1911 [c.]
EP 2:454
‘Reasoning’ (pub. 03.02.13-09:20). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from
Feb 03, 2013, 09:20 by Sami Paavola
Last revised: 
Jan 02, 2016, 16:16 by Mats Bergman