A reflection on feelings and the history of science.

This reflection attends to Paul White's call in his introduction to this Focus section for a history of science that is informed by the history of emotions. It offers a succinct historical exemplification of the possibilities of studying the history of science in terms of the history of emotions. It draws on Raymond Williams's concept of "structure of feeling" in arguing for the emergence of an adrenaline structure of feeling during the early twentieth century. It provides a mosaic of different views of the immanence of the adrenaline structure of feeling in diverse scientific realms by broaching some of the major themes that appear in the individual essays in this Focus section.