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Beginning with a new essay," Levels of Life and Death," Tibor G nti develops three general arguments about the nature of life. In" The Nature of the Living State," Professor G nti answers Francis Crick's puzzles about" life itself," offering a set of reflections on the parameters of the problems to be solved in origins of life research and, more broadly, in the search for principles governing the living state in general." The Principle of Life" describes in accessible language G nti's chief insight about the organization of living systems-his theory of the" chemoton," or chemical automaton. The simplest chemoton model of the living state consists of three chemically coupled subsystems: an autocatalytic metabolism, a genetic molecule and a membrane. G nti offers a fresh approach to the ancient problem of" life criteria," articulating a basic philosophy of the units of life applicable to the deepest theoretical considerations of genetics, chemical synthesis, evolutionary biology and the requirements of an" exact theoretical biology." New essays by E rs Szathm ry and James Griesemer on the biological and philosophical significance of G nti's work of thirty years indicate not only the enduring theoretical significance, but also the continuing relevance and heuristic power of G nti's insights. New endnotes by Szathm ry and Griesemer bring this legacy into dialogue with current thought in biology and philosophy. G nti's chemoton model reveals the fundamental importance of chemistry for biology and philosophy. G nti's technical innovation-cycle stoichiometry-at once captures the fundamental fact that biological systems are organized in cycles and at the same time offers a …