The Commens Dictionary

Quote from ‘Grand Logic: Book I. Of Reasoning in General. Introduction. The Association of Ideas’


As experience clusters certain ideas into sets, so does the mind too, by its occult nature, cluster certain ideas into sets. These sets have various forms of connection. The simplest are sets of things all on one footing and agreeing in each belonging to the set. Such a set is a class. The clustering of ideas into classes is the simplest form which the association of ideas by the occult nature of ideas, or of the mind, can take. Now, just as in association by contiguity an idea calls up the idea of the set in which experience has placed it, and thence one of the other ideas of that set, so in association by resemblance an idea calls up the idea of the set in which the mind’s occult virtue places it, and that conception perhaps gives, owing to some other circumstance, another of the particular ideas of the same set.

1893 [c.]
CP 7.392
‘Association by Contiguity’ (pub. 26.07.15-15:54). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from
Jul 26, 2015, 15:54 by Mats Bergman