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Commens
Digital Companion to C. S. Peirce
‘Hypothesis [as a form of reasoning]’ (pub. 03.02.13-17:59). 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-paul-carus-1.
Term: 
Hypothesis [as a form of reasoning]
Quote: 

… the division of the elementary kinds of reasoning into three heads was made by me in my first lectures and was published in 1869 in Harris’s Journal of Speculative Philosophy. I still consider that it had a sound basis. Only in almost everything I printed before the beginning of this century I more or less mixed up Hypothesis and Induction … .

The general body of logicians had also at all times come very near recognizing the trichotomy. They only failed to do so by having so narrow and formalistic a conception of inference ( as necessarily having formulated judgments for its premises) that they did not recognize Hypothesis (or, as I now term it, retroduction) as an inference … .

Source: 
Peirce, C. S. (1890-1913). Letters to Paul Carus. MS [L] 77.
References: 
CP 8.227-228
Date of Quote: 
1910 [c.]
URL: 

http://www.commens.org/dictionary/entry/quote-letters-paul-carus-1