William Bechtel is professor of philosophy and science studies at the University of California, San Diego. He is the author and editor of many books, including Discovering Complexity (with Robert C. Richardson, 1993) and Connectionism and the Mind (with Adele Abrahamsen, 2002), and he is editor of the journal Philosophical Psychology. He is the current chair of the Cognitive Science Society and past president of the Society for Philosophy and Psychology and the Southern Society for Philosophy and Psychology.

Part I. Introduction: Cell Mechanisms and Cell Biology: 1. A different kind of science; 2. The organization of science into disciplines; 3. The new discipline of cell biology; Part II. Explaining Cellular Phenomena through Mechanisms: 4. Historical conceptions of mechanism; 5. Twentieth century conceptions of mechanism; 6. Current conceptions of mechanisms; 7. Representing and reasoning about mechanisms; 8. Levels of organization and reduction; 9. Organization: from Cartesian to biological mechanisms; 10. Discovering and testing models of mechanisms; 11. Conclusions; Part III. The Locus of Cell Mechanisms: Terra Incognita Between Cytology and Biochemistry: 12. Cytological contributions to discovering cell mechanisms up to 1940; 13. Biochemical contributions to discovering cell mechanisms up to 1940; 14. The need to enter the Terra Incognita between cytology and biochemistry; Part IV. Creating New Instruments and Research Techniques to Study Cell Mechanisms: 15. The epistemology of evidence: judging artifacts; 16. The ultracentrifuge and cell fractionation; 17. The electron microscope and electron microscopy; 18. A case study of an artifact charge; 19. Equipped with new instruments and techniques to enter Terra Incognita; Part V. Entering the Terra Incognita Between Biochemistry and Cytology: 20. First steps towards cell biology at the Rockefeller Institute: Claude's introduction of cell fractionation; 21. Robert Bensley: an alternative approach to fractionalism; 22. Competing interpretations of fractions from normal cells; 23. Linking Claude's microsomes to protein synthesis; 24. Adding a biochemical perspective to the Rockefeller Laboratory; 25. Adding electron microscopy as a tool; 26. The state of cell studies at the end of the 1940's; Part VI. New Knowledge: the Mechanisms of the Cytoplasm: 27. The mitochondrion; 28. Microsomes, the endoplasmic reticulum, and ribosomes; 29. Two additional organelles; 30. Giving cell biology an institutional identity.