Second Intentional Logic   

Second Intentional Logic

Commens
Digital Companion to C. S. Peirce
Second Intentional Logic
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1893 | Book II. Division I. Part 2. Logic of Relatives. Chapter XII. The Algebra of Relatives | MS [R] 418:359-60

The scholastic doctors used to talk of first intentions and second intentions. First intentions were conceptions obtained by generalizing ordinary experiences. Second intentions were conception[s] obtained by generalizing conceptions themselves considered as objects of logical comparison. Now an abstract notion, that is, the name of a quality, is the first fruit of second-intentional thought. I have therefore called that branch of formal logic which takes account of this operation, and expresses it, Second Intentional Logic.