Discussion
Predictivism and the periodic table

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Abstract

This is a comment on the paper by Barnes (2005) and the responses from Scerri (2005) and Worrall (2005), debating the thesis (‘predictivism’) that a fact successfully predicted by a theory is stronger evidence than a similar fact known before the prediction was made. Since Barnes and Scerri both use evidence presented in my paper on Mendeleev’s periodic law (Brush, 1996) to support their views, I reiterate my own position on predictivism. I do not argue for or against predictivism in the normative sense that philosophers of science employ, rather I describe how scientists themselves use facts and predictions to support their theories. I find wide variations, and no support for the assumption that scientists use a single ‘Scientific Method’ in deciding whether to accept a proposed new theory.

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    According to Scerri: “The article by Scerri and Worrall argues that Brush should not draw back from even applying his view to the acceptance of the periodic table” (p. 11). Actually, Brush (2007) has not drawn back and stated clearly: “Having found little evidence for predictivism in physics, I did find it in chemistry, in particular in the case of Mendeleev’s periodic law” (p. 257). So what is the argument!

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