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Commens
Digital Companion to C. S. Peirce
‘Index’ (pub. 12.01.15-11:05). 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-notes-topical-geometry.
Term: 
Index
Quote: 

Signs are of three kinds,

1st, the icon, which represents its object by virtue of a character which it would equally possess did the object and the interpreting mind not exist;

2nd, the index, which represents its object by virtue of a character which it could not possess did the object not exist, but which it would equally possess did the interpreting mind not operate;

3rd, the symbol, which represents its object by virtue of a character which is conferred upon it by an operation of the mind.

[—]

An index represents an object by virtue of its connection with it. It makes no difference whether the connection is natural, or artificial, or merely mental.

Source: 
Peirce, C. S. (1899-1900 [c.]). Notes on Topical Geometry. MS [R] 142.
References: 
MS [R] 142:3-4
Date of Quote: 
1899-1900 [c.]
URL: 

http://www.commens.org/dictionary/entry/quote-notes-topical-geometry