Of course, after the lapse of more than a score of years, I can not recall verbatim the individual confessions and conversations. I remember only their general drift. As outlined by me, they are merely representative. But Nature has endowed me with a rare memory. The earliest ascertainable date is the age of two years and three months, when I recall having seen the coffin of a great-grandmother carried out of the house. I still preserve earlier memories, such as being held on my mother’s lap and contemplating her mountainous bare breast. I remember hearing the moon whistle shrilly (the six P. M. factory whistles as I gazed at the crescent moon). No reader should conclude from my trilogy that New York has been particularly immoral. Conditions [Sidenote: _Why an Underworld._] are about the same in all great cities, except that those of the United States are puritan towns compared with Europe. I have explored the Underworld in many cities of both continents, being temperamentally qualified. But in America’s smaller cities west of the meridian of Kansas City, the sexual Underworld is more bold and wields more political power than anywhere else in the United States or Europe. An Underworld exists in all cities of any size because human nature is what it is, and because of the social usages decreed by the blind Overworld, which happens to include the vast majority of mankind. Man is descended from the beasts, and still retains many of their instincts—particularly true of the atypic or atavic who throng the red-light districts. As the MEDICAL WORLD said of my AUTOBIOGRAPHY OF AN ANDROGYNE, the present work also “will be found a revelation of things undreamed of by most people. It is a contribution to the almost unexplored field of abnormal psychology.” II. The Place of the Androgyne in the Male Sex Scale. [Sidenote: _The Third Sex._] Throughout the ages that mankind have trod the earth, a broad and endless stream of masculinity has coursed along until swallowed in the ocean of eternity. In all streams—whether of water, lava, or manhood—the particles at the center flow most rapidly and the speed gradually decreases toward the banks. At occasional points along the latter, the particles are stationary, or there is even an eddy. (1) The TREMENDOUSLY VIRILE cause the surging rapids at the center of the masculine river. Their pre-eminent characteristic lies in excessive venery and excessive promiscuity. Sex holds by far the chief place in their thoughts. A large part of their waking hours is spent in the torture of unsatisfied longing. Their conversation with business intimates tends to sexual lines. They are the “black sheep” of families, never letting an opportunity go by without improving it. They are the seducers of girls under puberty. They are largely instrumental in securing a continuous flow of recruits to the rapidly decimating demimonde. Indeed the tremendously virile constitute the latter’s chief _raison d’etre_.