The Commens Dictionary
Quote from ‘Letters to Francis C. Russell’
In my view, logic has three parts, 1st the Elements which makes analysis of what one has to deal with; Arguments &c. 2nd Critic, which examines the conditions of the validity of arguments, and 3rd Methodeutic, which shows how any inquiry ought to be conducted.
MS [R] 387
‘Elements’ (pub. 12.10.18-11:42). 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-letters-francis-c-russell-1.