other ways from too constant absorption in lustful thoughts, which found vent in erotic verses and tales, generally destroyed soon after they were written. I have been subject since I was a boy to more or less prolonged fits of mental depression. How far I have inherited this tendency (my father and his father both married first cousins, and a neurotic diathesis has been characteristic of our family), or how far it has been aggravated by pernicious habits, I cannot say; cause and effect have no doubt acted and reacted on each other. "As I grew toward adolescence I endeavored to make self-abuse as close an imitation as possible of sexual intercourse by such methods as may be easily imagined. My biological studies (I won a scholarship and took honors at my university) were directed with most intent predilection toward the reproductive system, particularly the modifications of the copulatory organs in different animals and the diverse manner of their employment. The sexual instinct, whether in its normal or abnormal manifestations, is a subject which has always had a strong attraction for me, nor has it lost its fascination with the growth of years (I am now 60) nor the competition of other interests. "My very limited experience of the sexual system in women would lead me to believe that the _clitoris_ is the only peculiarly sensitive part of the female _genitalia_, coition giving no pleasure unless 'the trigger of love' is simultaneously manipulated, as can be done when intromission is effected _a tergo_; that the mind of a normally healthy maiden is altogether free from sexual excitement of a physical kind, and that little curiosity is felt about the precise _modus operandi_ of conjugal intercourse; but, nevertheless, I have good reason to believe that this, if not an unusual type, is by no means the only one that exists.