The editors would like to thank Antje Radeck and Josephine Fenger for their organizational help, Leona Geisler for her invaluable assistance in preparing the manuscript, and Jean-Luc Greenwood and Lucas Jurkovic for their handling of the bibliographical research. They would also like to thank Cathy Brown for her superb copyediting and Cynthia and Robert Swanson for the index. They are grateful to the criticisms and suggestions of an anonymous referee, as well as for support from the University of Ottawa and the Max Planck Institute for the History of Science in Berlin.