_To_ Kate Crane Gartz in acknowledgment of her unceasing efforts for a better world, and her fidelity to those who struggle to achieve it. CONTENTS PART THREE: THE BOOK OF LOVE PAGE CHAPTER XXVIII. THE REALITY OF MARRIAGE 3 Discusses the sex-customs now existing in the world, and their relation to the ideal of monogamous love. CHAPTER XXIX. THE DEVELOPMENT OF MARRIAGE 8 Deals with the sex-relationship, its meaning and its history, the stages of its development in human society. CHAPTER XXX. SEX AND YOUNG AMERICA 15 Discusses present-day sex arrangements, as they affect the future generation. CHAPTER XXXI. SEX AND THE "SMART SET" 23 Portrays the moral customs of those who set the fashion in our present-day world. CHAPTER XXXII. SEX AND THE POOR 29 Discusses prostitution, the extent of its prevalence, and the diseases which result from it. CHAPTER XXXIII. SEX AND NATURE 33 Maintains that our sex disorders are not the result of natural or physical disharmony. CHAPTER XXXIV. LOVE AND ECONOMICS 36 Maintains that our sex disorders are of social origin, due to the displacing of love by money as a motive in mating. CHAPTER XXXV. MARRIAGE AND MONEY 40 Discusses the causes of prostitution, and that higher form of prostitution known as the "marriage of convenience." CHAPTER XXXVI. LOVE VERSUS LUST 46 Discusses the sex impulse, its use and misuse; when it should be followed and when repressed. CHAPTER XXXVII. CELIBACY VERSUS CHASTITY 51 The ideal of the repression of the sex-impulse, as against the ideal of its guidance and cultivation. CHAPTER XXXVIII. THE DEFENSE OF LOVE 55 Discusses passionate love, its sanction, its place in life, and its preservation in marriage. CHAPTER XXXIX. BIRTH CONTROL 60 Deals with the prevention of conception as one of the greatest of man's discoveries, releasing him from nature's enslavement, and placing the keys of life in his hands. CHAPTER XL. EARLY MARRIAGE 66 Discusses love marriages, how they can be made, and the duty of parents in respect to them. CHAPTER XLI. THE MARRIAGE CLUB 71 Discusses how parents and elders may help the young to avoid unhappy marriages. CHAPTER XLII. EDUCATION FOR MARRIAGE 75 Maintains that the art of love can be taught, and that we have the right and the duty to teach it. CHAPTER XLIII. THE MONEY SIDE OF MARRIAGE 79