es numerous
quotations on this point; thus De Graaf wrote in his book on the sexual
organs of women: "Tales protuberantiae nymphae appellantur ea propter quod
aquis e vesica prosilientibus proxime adstare reperiantur, quandoquidem
inter illas, tanquam duos parietes, urina magno impetu cum sibilo saepe et
absque labiorum irrigatione erumpit, vel quod sint castitatis praesides,
aut sponsam primo intromittant."

[94] Havelock Ellis, "The Bladder as a Dynamometer," _American Journal of
Dermatology_, May, 1902. If a woman who has never been pregnant, standing
in the erect position before commencing the act of urination presses apart
the labia minora with index and middle fingers the stream will be
projected forward so as to fall usually at a considerable distance in
front of a vertical line from the meatus; if when the act is half
completed the fingers are removed, the labia close together and the
stream, though maintained at a constant pressure, at once changes its
character and direction.

[95] In poetry this term was employed by Plautus, _Pseudolus_, Act IV, Sc.
7. The Greek aidoion sometimes meant vagina and sometimes the external
sexual parts; kolpos was used for the vagina alone.

[96] It is curious, however, that the European physicians of the
seventeenth and even eighteenth centuries were doubtful of its value as a
sign of virginity and considered it often absent.

[97] For a summary of the beliefs and practices of various peoples with
regard to the hymen and virginity see Ploss and Bartels, _Das Weib_, vol.
i, Chapter XVI.

II

The Object of Detumescence--Erogenous Zones--The Lips--The Vascular
Characters of Detumescence--Erectile Tissue--Erection in Woman--Mucous
Emission in Women--Sexual Connection--The Human Mode of
Intercourse--Normal Variations--The Motor Characters of
Detumescence--Ejaculation--The Virile Reflex--The General Phenomena of
Detumescence--The Circulatory and Respiratory Phenomena--Blood
Pressure--Cardiac Disturbance--Glandular Activity--Distillatio--The
Essentially Motor Character of Detumescence--Involuntary Muscular
Irradiation to Bladder, etc.--Erotic Intoxication--Analogy of Sexual
Detumescence and Vesical Tension--The Specifically Sexual Movements of
Detumescence in Man--In Woman--The Spontaneous Movements of the Genital
Canal in Woman--Their Function in Conception--Part Played by Active
Movement of the Spermatozoa--The Artificial Injection of Semen--The Facial
Expression During