The Blush the Sanction of Modesty--The Phenomena of Blushing--Influences
Which Modify the Aptitude to Blush--Darkness, Concealment of the Face,
Etc.

IV.

Summary of the Factors of Modesty--The Future of Modesty--Modesty an
Essential Element of Love.


THE PHENOMENA OF SEXUAL PERIODICITY.

I.

The Various Physiological and Psychological Rhythms--Menstruation--The
Alleged Influence of the Moon--Frequent Suppression of Menstruation among
Primitive Races--Mittelschmerz--Possible Tendency to a Future
Intermenstrual Cycle--Menstruation among Animals--Menstruating Monkeys and
Apes--What is Menstruation--Its Primary Cause Still Obscure--The Relation
of Menstruation to Ovulation--The Occasional Absence of Menstruation in
Health--The Relation of Menstruation to "Heat"--The Prohibition of
Intercourse during Menstruation--The Predominance of Sexual Excitement at
and around the Menstrual Period--Its Absence during the Period Frequently
Apparent only.

II.

The Question of a Monthly Sexual Cycle in Men--The Earliest Suggestions of
a General Physiological Cycle in Men--Periodicity in Disease--Insanity,
Heart Disease, etc.--The Alleged Twenty-three Days' Cycle--The