In a recent series of articles, and in his latest book, James Cornman has proposed and defended a definition of ‘observation term’. The original definition appeared in [3]; in [4] Cornman defended this definition against some criticisms offered by P. K. Machamer, and also revised it somewhat; the revised definition is restated in [2] and used there in Cornman's discussion of the identity theory of the mind. Finally, in [1], Cornman again invokes his definition in defending scientific instrumentalism, and defends (...) it against various generalized attacks on the very possibility of drawing a distinction between observational and theoretical terms which will do the sort of work Cornman wants it to do. (shrink)

Sometimes a theory is interpreted realistically--i.e., as literally true--whereas sometimes a theory is interpreted instrumentalistically--i.e., as merely a convenient device for summarizing, systematizing, deducing, etc., a given body of observable facts. This paper is part of a program aimed at determining the basis on which scientists decide on which of these interpretations to accept a theory. I proceed by examining one case: the nineteenth-century debates about the existence of atoms. I argue that there was a gradual transition from an instrumentalist (...) to a realistic acceptance of the atomic theory, because of gradual increases in its predictive power, the "testedness" of its hypotheses, the "determinateness" of its quantities, and because of resolutions of doubts about the acceptability of its basic explanatory concepts. (shrink)