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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

as had that of our secondary maximum in the preceding curves; for one of 

these secondary maxima is due to the influence of the 1894 curve with its 

primary Tuesday maximum, and the other to the similar influence of Curve 

_C_ with its primary Thursday maximum. Similarly, the veiled third 

secondary maximum is due to the influence of Curve _E_. Probably, any 

student of curves will concede that, on a still larger average, the two 

secondary maxima of Curve _F_ would be replaced by a single one on 

Wednesday or Thursday. 

 

One more question remains for consideration in connection with this weekly 

rhythm. Is it possible to trace any connection between the weekly and 

yearly rhythms of such a character that the weekly day of maximum 

discharge should vary from month to month in the year; in other words, 

does the greater frequency of a Sunday discharge characterize one part of 

the year, that of a Tuesday another, and so on? In order to answer this 

question I have re-calculated all my data, with results that are 

graphically represented in Chart 13. These curves prove that the Sunday 

maxima discharges occur in March and September, and the minima in June; 

that the Monday maxima discharges occur in September, Friday in July, and 

so on. Thus, there is a regular rhythm, according to which the days of 

maximum discharge vary from one month of the year to another; and the 

existence of this final rhythm appears to me very remarkable. I would 

especially direct attention to the almost geometric symmetry of the Sunday 

curve, and to the only less complete symmetry of the Thursday and Friday 

curves. Certainly in these rhythms we have an ample field for farther 

study and speculation. 

 

I have now concluded my study of this fascinating inquiry; a study that is 

necessarily incomplete, since it is based upon records furnished by one 

individual only. The fact, however, that, even with so few observations, 

and notwithstanding the consequently exaggerated disturbing influence of 

minor irregularities, such remarkable and unexpected symmetry is evidenced 

by these curves, only increases one's desire to have the opportunity of 

handling a series of observations sufficiently numerous to render the 

generalizations induced from them absolutely conclusive. I would again 

appeal[384] to heads of colleges to assist this inquiry by enlisting in 

its aid a band of students. If only one hundred students, living under 

similar conditions, could be induced to keep such records with scrupulous 

regularity for only twelve months, the results induced from such a series 

of observations would be more than ten times as valuable as those which 

have only been reached after ten years' observations on my part; and, if 

other centuries of students in foreign and colonial colleges--e.g., in 

Italy, India, Australia, and America--could be similarly enlisted in this 

work, we should quickly obtain a series of results exhibiting the sexual 

needs and sexual peculiarities of the male human animal in various 

climates. Obviously, however, the records of any such students would be 

worse than useless unless their care and accuracy, on the one hand, and 

their habitual chastity, on the other, could be implicitly guaranteed. 

 

 

FOOTNOTES: 

 

[373] First published in the _University Magazine and Free Review_ of 

February, 1898, and since reprinted as a pamphlet. A preliminary 

communication appeared in _Nature_, May 14, 1891. 

 

[374] [Later study (1906) has convinced me that my attempt to find a 


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