Peirce (1878)

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Peirce, Charles Sanders. (1878) How to Make Our Ideas Clear. Popular Science Monthly 12, 286-302.

Title How to Make Our Ideas Clear
Resource Type journal article
Author(s) Charles Sanders Peirce
Year 1878
Journal Popular Science Monthly
Volume 12
Pages 286-302


Whoever has looked into a modern treatise on logic of the common sort, will doubtless remember the two distinctions between clear and obscure conceptions, and between distinct and confused conceptions. They have lain in the books now for nigh two centuries, unimproved and unmodified, and are generally reckoned by logicians as among the gems of their doctrine. A clear idea is defined as one which is so apprehended that it will be recognized wherever it is met with, and so that no other will be mistaken for it. If it fails of this clearness, it is said to be obscure.