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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

part, zigzags between a frequency of 4 and 9, but on the 

twenty-fourth day it falls to 1, and then rises uninterruptedly 

to a height of 11 on the twenty-seventh day, falling to 2 on the 

next day. Whether a really menstrual rhythm is thus indicated I 

do not undertake to decide, but I am inclined to agree with E.M. 

himself that there is no definite evidence of it. "It looks to 

me," he writes, "as if the only real rhythm (putting aside the 

annual cycle) will be found to be the average period between the 

ecboles, varying in different persons, but in my case, about nine 

and one-eighth days. May not the ecbolic period in men be 

compared to the menstrual period in women, and be an example of 

the greater katabolic activity of men? There is the period of 

tumescence, and the ecbole constituting the detumescence. The 

week-end holiday would hasten the detumescence, but about every 

third week-end there would tend to be delay to enable the system 

to get back into its regulation nine or ten days' stride. This 

might possibly be the explanation of the curves. The recent 

emissions were nearly all involuntary during sleep. Age may have 

something to do with the change in character." 

 

E.M.'s curves frequently show the influence of weekly 

periodicity, in the tendency to ecbole on Sunday, or sometimes on 

Saturday or Monday. In recent years there has been some tendency 

for this climax to be thrown towards the middle of the week, but, 

on the whole, Wednesday is the point of lowest frequency. 

 

In another case, the subject, A.N., who has spent nearly all his 

life in the State of Indiana, has kept a record of sexual 

manifestations between the ages of 30 and 34. The data, which 

cover four years, have not been sent to me in a form which 

enables the possibility of a monthly curve to be estimated, but 

A.N., who has himself arranged the data on a lunar monthly basis, 

considers that a monthly curve is thus revealed. "My memoranda," 

he writes, "show that discharges occur most frequently on the 

first, second, and third days after new moon. There is also 

another period on the fourteenth and fifteenth, which might 

indicate a semi-lunar rhythm. The days of minimum discharge are 

the seventh, eighth, twenty-second, and twenty-third." It may be 

added that the yearly average of ecbolic manifestations, varying 

between 50 and 55, comes out as 52, or exactly one per week. 

 

A weekly periodicity is very definitely shown by A.N.'s data. 

Sunday once more stands at the head of the week as regards 

frequency, in this case very decisively. The figures are as follows:-- 

 

Sun. Mon. Tues. Wed. Thurs. Fri. Sat. 

48 21 24 35 28 26 27 

 

In another case which has reached me from the United States, the 

data are slighter, but deserve note, as the subject is a trained 

psychologist, and I quote the case in his own words. Here, it 

will be seen, there appears to be a tendency for the ecbolic 

cycle to cover a period of about six weeks. In this case, also, 

there is a tendency for the climax to occur about Saturday or 

Sunday. "X. is 38 years old, unmarried, fair health, pretty good 

heredity; university trained, and engaged in academic pursuits. 

He thinks he may have completed puberty at about 13, though he 


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