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GENERAL PREFACE
THE EVOLUTION OF MODESTY-1.1
THE EVOLUTION OF MODESTY-1.2
THE EVOLUTION OF MODESTY-1.3
THE EVOLUTION OF MODESTY-1.4
THE EVOLUTION OF MODESTY-1.5
THE EVOLUTION OF MODESTY-1.6
THE EVOLUTION OF MODESTY-2.1
THE EVOLUTION OF MODESTY-2.2
THE EVOLUTION OF MODESTY-2.3
THE EVOLUTION OF MODESTY-2.4
THE EVOLUTION OF MODESTY-2.5
THE EVOLUTION OF MODESTY-3
THE EVOLUTION OF MODESTY-4
THE PHENOMENA OF SEXUAL PERIODICITY-1.1
THE PHENOMENA OF SEXUAL PERIODICITY-1.2
FOOTNOTES
THE PHENOMENA OF SEXUAL PERIODICITY-2.1
THE PHENOMENA OF SEXUAL PERIODICITY-2.2
THE PHENOMENA OF SEXUAL PERIODICITY-2.3
THE PHENOMENA OF SEXUAL PERIODICITY-3.1
THE PHENOMENA OF SEXUAL PERIODICITY-3.2
THE PHENOMENA OF SEXUAL PERIODICITY-3.3
THE PHENOMENA OF SEXUAL PERIODICITY-3.4
THE PHENOMENA OF SEXUAL PERIODICITY-3.5
FOOTNOTES
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-1.1
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-1.2
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-1.3
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-1.4
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-1.5
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-1.6
FOOTNOTES
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-2.1
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-2.2
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-2.3
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-2.4
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-3.1
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-3.2
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-3.3
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-3.4
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-3.5
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-3.6
AUTO-EROTISM: A STUDY OF THE SPONTANEOUS MANIFESTATIONS OF THE SEXUAL IMPULSE-3.7
FOOTNOTES
APPENDIX A-1.1
APPENDIX A-1.2
APPENDIX B-1.1
APPENDIX B-1.2
APPENDIX C-1.1
APPENDIX C-1.2
INDEX OF AUTHORS

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. 

 

 

Throughout the vegetable and animal worlds the sexual functions are 

periodic. From the usually annual period of flowering in plants, with its 

play of sperm-cell and germ-cell and consequent seed-production, through 

the varying sexual energies of animals, up to the monthly effervescence of 

the generative organism in woman, seeking not without the shedding of 

blood for the gratification of its reproductive function, from first to 

last we find unfailing evidence of the periodicity of sex. At first the 

sun, and then, as some have thought, the moon, have marked throughout a 

rhythmic impress on the phenomena of sex. To understand these phenomena we 

have not only to recognize the bare existence of that periodic fact, but 

to realize its implications. 

 

Rhythm, it is scarcely necessary to remark, is far from characterizing 

sexual activity alone. It is the character of all biological activity, 

alike on the physical and the psychic sides. All the organs of the body 

appear to be in a perpetual process of rhythmic contraction and expansion. 

The heart is rhythmic, so is the respiration. The spleen is rhythmic, so 

also the bladder. The uterus constantly undergoes regular rhythmic 

contractions at brief intervals. The vascular system, down to the smallest 

capillaries, is acted on by three series of vibrations, and every 

separate fragment of muscular tissue possesses rhythmic contractility. 

Growth itself is rhythmic, and, as Malling-Hansen and subsequent observers 

have found, follows a regular annual course as well as a larger cycle. On 

the psychic sides attention is rhythmic. We are always irresistibly 

compelled to impart a rhythm to every succession of sounds, however 

uniform and monotonous. A familiar example of this is the rhythm we can 

seldom refrain from hearing in the puffing of an engine. A series of 

experiments, by Bolton, on thirty subjects showed that the clicks of an 

electric telephone connected in an induction-apparatus nearly always fell 

into rhythmic groups, usually of two or four, rarely of three or five, the 

rhythmic perception being accompanied by a strong impulse to make 

corresponding muscular movements.[75] 

 

It is, however, with the influence--to some extent real, to some extent, 

perhaps, only apparent--of cosmic rhythm that we are here concerned. The 

general tendency, physical and psychic, of nervous action to fall into 

rhythm is merely interesting from the present point of view as showing a 

biological predisposition to accept any periodicity that is habitually 

imposed upon the organism.[76] Menstruation has always been associated 

with the lunar revolutions.[77] Darwin, without specifically mentioning 

menstruation, has suggested that the explanation of the allied cycle of 

gestation in mammals, as well as incubation in birds, may be found in the 


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