The author demonstrates that perfect marriage is a scientific possibility and that legal marriage and divorce simply conform to civil laws. He very clearly outlines the reason why civilization makes little or no progress in dealing with the social evil and other sex problems. The publishers place this book before an intelligent public, believing, that more _real_ knowledge can be gained by its study, than by any other known method, because _First._ The reader is brought face to face with himself, and nature. _Second._ The reader can demonstrate the truth of the propositions set forth. _Third._ The methods, rules, and laws have been verified by intelligent men and women who have lived the life. _Fourth._ "Sex," The Divine Principle which all human beings should understand, has been presented in plain simple terms, and elucidated, so that the reader _cannot_ fail to understand the true path of moral progress. This volume is not a romance, a fairy tale nor a dream intended to entertain or amuse, but a scientific instruction which will elevate the individual and the race, develop self respect, self control, morality and love. If the propositions presented by the author are correct--let the standards be changed; _if_ the propositions are _incorrect_, they will not disturb the standards of today. THE PUBLISHERS. SEX--THE UNKNOWN QUANTITY The Spiritual Function of Sex CONTENTS INTRODUCTION CHAPTER I SEX UNIVERSAL AND ETERNAL 19 Sex the fundamental basis of the universe; sex in organic life; the law of attraction and repulsion in animal and plant life; sex attraction and repulsion in human life; how differentiated and why; some secrets of modern chemistry; the cosmic law of involution and evolution; the symbol of the serpent in a new light; what is "the power of the gods" referred to in ancient mythology; some erroneous ideas in regard to the sex function; the philosophy of restraint; the inner sex-function and its outward expression compared; the senses as avenues of inspiration; the creation of form and sense-objects; what constitutes a "perfect and complete being?" the theory of "counterparts" and its spiritual significance; is procreation the highest function of sex; what constitutes the fundamental law of love? the various expressions of the love-nature from inorganic to organic life. CHAPTER II FROM SEX WORSHIP TO SEX DEGRADATION 29