Foreword; B. Barber. Preface; I.B. Cohen. Part One: Introduction. One. An Analysis of Interactions btween the Natural Sciences and the Social Sciences; I.B. Cohen. Part Two: Perspectives on the Relations between the Natural Sciences and the Social Sciences. Two. How Numerical Sociology began by Counting Suicides: from Medical Pathology to Social Pathology; I. Hacking. Three. Probabilistic Thinking, the Natural Sciences and the Social Sciences: Changing Configurations 1800-1850; B.-P. Lecuyer. Part Three: Some Influences of the Natural Sciences on the Social Sciences. Four. The Scientific Revolution and the Social Sciences; I.B. Cohen. Five. Blackstone's Newtonian Dissent; N.M. Swerdlow. Six. From Political Economy to Market Mechanics: the Jevonian Moment in the History of Economics; M. Schabas. Seven. The Technology of Nature: Marx's Thoughts on Darwin; G. Pancaldi. Eight. Towards the Social Organism: Herbert Spencer & William B. Carpenter on the Analogical Method; V.L. Hilts. Part Four: Some Influences of the Social Sciences on the Natural Sciences. Nine. Darwin and Agronomists: an Influence of Political Economy on Scientific Thought; S.S. Schweber. Ten. Milne-Edwards, Darwin, Durkheim and the Division of Labor: a Case Study in Reciprocal Conceptual Exchanges between the Social and Natural Sciences; C. Limoges. Eleven. From Quetelet to Maxwell: Social Statistics and the Origins of Statistical Physics; T. Porter. Part Four: Conclusion. Twelve. A Conversation with Harvey Brooks on The Natural Sciences and the Social Sciences in the Light of Current Policy Questions. Index.