Foreword / John. J. Lee Preface / Joseph Seckbach and Martin Grube Acknowledgements List of authors and their addresses PART 1: GENERAL INTRODUCTION On the Origin of Symbiosis [Jan Sapp] Symbioses and Stress [Martin Grube, James F. White, and Joseph Seckbach] PART 2: SYMBIOTIC ORIGIN OF EUKARYOTES Problems and Progress in Understanding the Origins of Mitochondria and Plastids [Bruce A. Curtis and John M. Archibald] The Origin of Eukarya as a Stress Response of Two-Membrane-Bo