The Commens Dictionary

Quote from ‘Grand Logic 1893: Division II. Methodology. Chapter XV. Breadth and Depth’


An imaginary increase of information is an assumption or supposition; but the former word is preferable. An increase of information by induction, hypothesis, or analogy, is a presumption. (A legal presumption is a presumption which follows an accepted rule of the courts, irrespective of the dictates of good sense.) A very weak presumption is a guess. A presumption opposed to direct testimony is a conjecture, or, if weak, a surmise.

CP 2.430
‘Presumption [as a form of reasoning]’ (pub. 02.01.13-18:48). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from
Jan 02, 2013, 18:48 by Sami Paavola
Last revised: 
Jan 07, 2014, 01:01 by Commens Admin