The following five paragraphs are based on this article, abstracted or excerpted with permission of the copyright owner, the American Association for the Advancement of Science.) For detailed discussion of the early attempts to test this prediction see John Earman and Clark GlymourHistorical Studies in the Physical Sciences

For, S G Brush. The following five paragraphs are based on this article, abstracted or excerpted with permission of the copyright owner, the American Association for the Advancement of Science.) For detailed discussion of the early attempts to test this prediction see John Earman and Clark GlymourHistorical Studies in the Physical Sciences. 1980.