INTRODUCTION AND PREFACE TO SECOND EDITION, Author’s Preface, PART I. THE SOCIAL LIFE OF MONKEYS AND APES, I. Human Sociology and the Sub-Human Primates, II. Mammalian Sociology, III. Sexual Periodicity, IV. The Breeding Season and Society, V. The Physiology of the Reproductive Processes of Mammals other than Primates, VI. The General Character of the Menstrual Cycle, VII. The Morphology, Physiology, and Interpretation of the Menstrual Cycle, VIII. The OEstrous Cycle and Behaviour, IX. The Menstrual Cycle and Behaviour, X. The Individual within the Group, XI. Apes and Monkeys in the Wild: General, XII. Baboons in South Africa, XIII. The Social Groups of Wild Apes and Monkeys, XIV. The Hamadryas Baboon Colony, XV. Dominance and the Liberation of Sexual Responses, XVI. The Communal Life of the Baboon, XVII. The Development of Social and Sexual Responses, XVIII. Altruism and Society, XIX. The Social Scale, BIBLIOGRAPHY, PART II. POSTSCRIPT AND APPENDICES TO THE SECOND EDITION, POSTSCRIPT, APPENDICES