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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

statistical study ("La Reaction de l'Organisme sous l'Influence 

Physico-Chimiques des Agents Meteorologiques," _Archives 

d'Anthropologie Criminelle_, Feb., 1909) that the 

conception-rate, as well as the periodicity of suicide and allied 

phenomena, is due to the action of the chemical rays on the 

unpigmented skin in early spring, this action being 

physiologically similar to that of alcohol. He seeks thus to 

account for the marked and early occurrence of such periodic 

phenomena in Greenland and other northern countries where there 

is much chemical action (owing to the clear air) in early spring, 

but little heat. This explanation would not cover an autumnal 

climax, the existence of which Gaedeken denies. 

 

In order to obtain a fairly typical conception-curve for Europe, and to 

allow the variations of local habit and custom to some extent to 

annihilate each other, I have summated the figures given by Mayr for about 

a quarter of a million births in Germany, France, and Italy,[156] 

obtaining a curve (Chart 2) of the conception-rate which may be said 

roughly to be that of Europe generally. If we begin at September as the 

lowest point, we find an autumn rise culminating in the lesser maximum of 

Christmas, followed by a minor depression in January and February. Then 

comes the great spring rise, culminating in May, and followed after June 

by a rapid descent to the minimum. 

 

In Canada (see e.g., _Report of the Registrar General of the 

Province of Ontario_ for 1904), the maximum and minimum of 

conceptions alike fall later than in Europe; the months of 

maximum conception are June, July, and August; of minimum 

conception, January, February, and March. June is the favorite 

month for marriage. 

 

It would be of some interest to know the conception-curve for the 

well-to-do classes, who are largely free from the industrial and 

social influences which evidently, to a great extent, control the 

conception-rate. It seems probable that the seasonal influence 

would here be specially well shown. The only attempt I have made 

in this direction is to examine a well-filled birthday-book. The 

entries show a very high and equally maintained maximum of 

conceptions throughout April, May and June, followed by a marked 

minimum during the next three months, and an autumn rise very 

strongly marked, in November. There is no December rise. As will 

be seen, there is here a fairly exact resemblance to the yearly 

ecbolic curve of people of the same class. The inquiry needs, 

however, to be extended to a very much larger number of cases. 

 

Mr. John Douglass Brown, of Philadelphia, has kindly prepared and 

sent me, since the above was written, a series of curves showing 

the, annual periodicity of births among the educated classes in 

the State of Pennsylvania, using the statistics as to 4,066 

births contained in the Biographical Catalogue of Matriculates of 

the College of the University of Pennsylvania. Mr. Brown prepared 

four curves: the first, covering the earliest period, 1757-1859; 

the second, the period 1860-1876; the third, 1877-1893; while the 

fourth presented the summated results for the whole period. (The 

dates named are those of the entry to classes, and not of actual 

occurrence of birth.) A very definite and well-marked curve is 


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