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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

seems to me to be wholly unconnected with the sexual impulse. The 

winter half of the year (from the beginning of October to the end 

of March), when outdoor life has lost its attractions, and much 

time must be spent in the house, is naturally the season for 

reading. But during the two central months of winter, December 

and January, the attraction of reading meets with a powerful 

counter-attraction in the excitement produced by the approach of 

Christmas, and the increased activity of social life which 

accompanies and for several weeks follows Christmas. In this way 

the other four winter months--October and November at the 

autumnal end, and February and March at the spring end--must 

inevitably present the two chief reading climaxes of the year; 

and so the reports of lending libraries present us with figures 

which show a striking, but fallacious, resemblance to the curves 

which are probably produced by more organic causes. 

 

I am far from wishing to deny that the impulse which draws young 

men and women to imaginative literature is unconnected with the 

obscure promptings of the sexual instinct. But, until the 

disturbing influence I have just pointed out is eliminated, I see 

no evidence here for any true seasonal periodicity. Possibly in 

prisons--the value of which, as laboratories of experimental 

psychology we have scarcely yet begun to realize--more reliable 

evidence might be obtained; and those French and other prisons 

where novels are freely allowed to the prisoners might yield 

evidence as regards the consumption of fiction as instructive as 

that yielded at Clermont concerning the consumption of bread. 

 

Certain diseases show a very regular annual curve. This is notably the 

case with scarlet fever. Caiger found in a London fever hospital a marked 

seasonal prevalence: there was a minor climax in May (repeated in July), 

and a great autumnal climax in October, falling to a minimum in December 

and January. This curve corresponds closely to that usually observed in 

London.[170] It is not peculiar to London, or to urban districts, for in 

rural districts we find nearly the same spring minor maximum and major 

autumnal maximum. In Russia it is precisely the same. Many other epidemic 

diseases show very similar curves. 

 

An annual curve may be found in the expulsive force of the bladder as 

measured by the distance to which the urinary stream can be projected. 

This curve, as ascertained for one case, is interesting on account of the 

close relationship between sexual and vesical activity. After a minimum 

point in autumn there is a rise through the early part of the year to a 

height maintained through spring and summer, and reaching its maximum in 

August.[171] This may be said to correspond with the general tendency 

found in some cases of nocturnal seminal emissions from a winter minimum 

to an autumn maximum. 

 

There is an annual curve in voluntary muscle strength. Thus in Antwerp, 

where the scientific study of children is systematically carried out by a 

Pedological Bureau, Schuyten found that, measured by the dynamometer, both 

at the ages of 8 and 9, both boys and girls showed a gradual increase of 

strength from October to January, a fall from January to March and a rise 

to June or July. March was the weakest month, June and July the 

strongest.[172] 

 

Schuyten also found an annual curve for mental ability, as tested by power 


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