Although epidemiology as a scientific study of disease in populations claimed an independent disciplinary status already in the mid–nineteenth century, its history in the twentieth century can be seen as a continuous and often contentious attempt to define the field’s social and intellectual boundaries vis-à-vis a variety of neighboring scientific fields and public health practices. In a period dominated by laboratory biomedical sciences, epidemiologists repeatedly tried to spell out how their discipline met the requirements of scientificity despite its focus on disease as a collective phenomenon and its reliance on nonlaboratory methods. This article asks about the relationship between the changing institutional and intellectual contexts of British epidemiological practice and the epidemiologists’attempts to define both science in general and epidemiology in particular. An examination of the epidemiologists’boundary-making endeavors is also used to reflect on the circumstances in which scientists engage in the discourse of disciplinary demarcations.

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An analytical scheme that differentiates among the various types of cognitive and social functions of citations is used as the basis for an analysis of the results of a questionnaire designed to probe the citing behavior of a group of scientists who had cited one of four papers originating from a single biochemical laboratory. Even when papers fall within a relatively well-defined research area and are based on research conducted within a single lab, groups of scientists to which a given paper is of relevance can have quite distinct internal structures. We argue that the scientists'subjective reasons for citing a given work do not correspond with the actual argumentative uses of cited articles in citing texts. Scientists appear to regard the papers they cite as having a rather generalized significance even if in their citations they refer to very specific claims made in the original texts. The consequences of these findings for a theory of citation and for the use of citations in science studies are discussed.

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