The contributions present a coherent set of case studies of practices, technologies and stragegies aimed at the isolation, investigation, manipulation, production and uses of molecules.

Introduction 1. Plants, Cells and Bodies: The Molecular Biography of Colchicine, 1930-1975 2. Chemistry in the Clinic: The Research Career of Donald Dexter Van Slyke 3. Vitamins and the Dynamics of Molecularization: Biochemistry, Policy and Industry in Britain, 1914-1939 4. Producing Molecular Therapeutics from Human Blood: Edwin Cohn's Wartime Enterprise 5. The Molecularization of Cancer Etiology in the Postwar United States: Instruments, Politics and Management 6. Following Molecules: Hemoglobin between the Clinic and the Laboratory 7. The Struggle over Metabolic Screening 8. "A 'Cage' of Ovulating Females": The History of the Early Oral Contraceptive Pill Clinical Trials, 1950-1959 9. Immunotherapy of Cancer from Coley's Toxins to Interferon: Molecularization of a Therapeutic Practice 10. Reflections: Molecularization, Standardization and the History of Science

Soraya de Chadarevian, Harmke Kamminga, both Wellcome Unit for the History of Medicine, Cambridge, UK