Classical analyses of differences among the sciences have measured social but not cognitive structure. This paper suggests a method for describing differences among fields in the processes of knowledge growth. The method examines closely what is said about a particular scientific paper when it is cited in later works, and traces changes over time, if they occur. A comparative analysis of cases drawn from neuropharmacology and the sociology of science is used to illustrate the approach. The two papers analyzed show strong differences in the level of generality at which the contents of the original papers are cited. Lack of change over time in how the sociology of science paper is cited is attributed to the lack of attention to its main empirical knowledge claim.
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