Abstract
That a given piece of copper conducts electricity increases the credibility of statements asserting that other pieces of copper conduct electricity, and thus confirms the hypothesis that all copper conducts electricity. But the fact that a given man now in this room is a third son does not increase the credibility of statements asserting that other men now in this room are third sons, and so does not confirm the hypothesis that all men now in this room are third sons.... The difference is that in the former case the hypothesis is a lawlike statement; while in the latter case, the hypothesis is a merely contingent or accidental generality. Only a statement that is lawlike-regardless of its truth or falsity or its scientific importance-is capable of receiving confirmation from an instance of it; accidental statements are not (Goodman 1965, p. 73).
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