Philosophy › The 19th century › Pragmatism
Charles Sanders Peirce
1839–1914· Philosopher· Knowledge, logic & science
Well documentedSolid records, texts or physical evidence.
American logician and scientist who founded pragmatism and helped invent modern logic, but died poor and largely unrecognized.
See it on the Philosophy map →The idea
The idea: a concept's meaning is the sum of its conceivable practical effects. Calling something 'hard' just means many other substances will not scratch it. A scientist at the US Coast Survey for three decades, he joined the Metaphysical Club in Cambridge, Massachusetts, in the early 1870s. He also developed logical quantifiers independently of Frege, named 'abduction,' inference to the best explanation, and pioneered the theory of signs. Main objection: some meaningful ideas, about the distant past or mathematics, seem to have no testable effects.
Why it matters
He gave America its first original philosophy, and his logic, theory of signs (semiotics) and fallibilism, the view that any belief may need revision, still inform science.
Legacy and sources
About 100,000 pages of manuscripts at Harvard; little was published in his lifetime. Collected Papers appeared 1931–58, and a fuller chronological edition continues.
Still debated
How his scattered system fits together; he never finished a major book, and scholars still reconstruct his views from drafts and fragments.
Connections (2)
▸Charles Sanders Peirce founded PragmatismWell documented
The connection
In discussions at the Metaphysical Club, Peirce proposed his 'pragmatic maxim': to clarify any idea, list the practical effects its object could have; that list is the idea's whole meaning. He took the name from Kant's word pragmatisch. William James later credited him publicly, launching pragmatism as a movement.
When and how
Cambridge, Massachusetts, early 1870s, with William James and Oliver Wendell Holmes Jr.; published as 'How to Make Our Ideas Clear,' Popular Science Monthly, January 1878.
How we know
The 1878 essay, James's 1898 Berkeley lecture naming Peirce as founder, and Peirce's 1905 account of the term's origin.
Debates and open questions
Whether James's movement was really Peirce's: the word reached print only in 1898, and Peirce renamed his own view 'pragmaticism,' 'ugly enough to be safe from kidnappers.'
▸Charles Sanders Peirce inspired William JamesWell documented
The connection
Peirce argued that the meaning of an idea is the sum of its practical effects: calling something hard means it will not be scratched by many other substances. James, his friend since Harvard student days, built his theories of truth, religious belief and psychology on this principle, and later helped Peirce when his career collapsed.
When and how
Both belonged to the 'Metaphysical Club', an informal discussion group in Cambridge, Massachusetts, in the early 1870s; Peirce published 'How to Make Our Ideas Clear' in 1878.
How we know
James publicly credited Peirce in 1898, and decades of their letters survive.
Debates and open questions
Peirce felt James distorted his idea; scholars still debate how much James's pragmatism owes to Peirce versus James's own psychology.