The mismatch between common representations of “science” and the miscellany of materials typically studied by the historian of science is traced to a systematic ambiguity that may itself be traced to early modern Europe. In that cultural setting, natural philosophy came to be rearticulated as involving both contemplative and practical knowledge. The resulting tension and ambiguity are illustrated by the eighteenth‐century views of Buffon. In the nineteenth century, a new enterprise called “science” represents the establishment of an unstable ideology of (...) natural knowledge that was heavily indebted to those early modern developments. The two complementary and competing elements of the ideology of modern science are accordingly described as “natural philosophy” and “instrumentality” . The history of science in large part concerns the story of their shifting, often mutually denying, interrelations. (shrink)