The Commens Dictionary
Quote from ‘Grand Logic 1893: Division III. Substantial Study of Logic Chapter VI. The Essence of Reasoning’
Ratiocination is defined by St. Thomas as the operation by which reason proceeds from the known to the unknown.
‘Ratiocination’ (pub. 03.02.13-09:31). 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-grand-logic-1893-division-iii-substantial-study-logic-chapter-vi-essence.