The philosophy of Raymond Ruyer was an important if subterranean influence on twentieth-century French thought, and explicitly engaged with by figures such as Maurice Merleau-Ponty, Georges Canguilhem, Gilbert Simondon, and Gilles Deleuze. The Genesis of Living Forms is Ruyer's most focussed and forceful analysis of a central but apparently paradoxical biological phenomenon that also presents serious problems for philosophy: embryogenesis. When a cat develops from the early stages of fertilization to an adult, what is it that makes it the same cat? How is it that a living being can at once be the same and constantly changing? Ruyer's answer to these questions unfolds through a detailed set of encounters with major scientific fields, from particle physics to social psychology, arguing that the paradox can only be dissolved by seeing the role that form plays in the ongoing development of living beings. In Ruyer's view, embryogenesis is a central problem not just in the life sciences; every thing must possess a relation to a form that is characteristic of it, from carbon atoms to embryos, and to embryologists themselves.

� propos de l?auteur

Raymond Ruyer (1902-1987) was an influential philosopher of science and Professor of Philosophy at the Universite de Nancy. Jon Roffe is Vice-Chancellor's Postdoctoral Fellow at the University of New South Wales, and a founding editor of Parrhesia: A Journal of Critical Philosophy. The co-editor of a number of volumes on twentieth-century French philosophy, he is the author of Badiou's Deleuze (2012), Abstract Market Theory (forthcoming), Gilles Deleuze's Empiricism and Subjectivity (forthcoming), and the co-author of Lacan Deleuze Badiou (2014, with AJ Bartlett and Justin Clemens). Nicholas B. de Weydenthal is a doctoral candidate based in the School of Historical and Philosophical Studies and the Department of Management and Marketing at the University of Melbourne.

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