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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 seasonal periodicity of bad conduct in prisons is of interest 

as showing that we cannot account for psychic periodicity by 

invoking exclusively social causes. This theory of psychic 

periodicity has been seriously put forward, but has been 

investigated and dismissed, so far as crime in Holland is 

concerned, by J.R.B. de Roos, in the Transactions of the sixth 

Congress of Criminal Anthropology, at Turin, in 1906 (_Archivio 

di Psichiatria_ fasc. 3, 1906). 

 

The general statistics of suicides in Continental Europe show a very 

regular and unbroken curve, attaining a maximum in June and a minimum in 

December, the curve rising steadily through the first six months, sinking 

steadily through the last six months, but always reaching a somewhat 

greater height in May than in July.[164] Morselli shows that in various 

European countries there is always a rise in spring and in autumn (October 

or November).[165] Morselli attributes these spring and autumn rises to 

the influence of the strain of the early heat and the early cold.[166] In 

England, also, if we take a very large number of statistics, for instance, 

the figures for London during the twenty years between 1865 and 1884, as 

given by Ogle (in a paper read before the Statistical Society in 1886), we 

find that, although the general curve has the same maximum and minimum 

points, it is interrupted by a break on each side of the maximum, and 

these two breaks occur precisely at about March and October.[167] This is 

shown in the curve in Chart 6, which presents the daily average for the 

different months. 

 

The growth of children follows an annual rhythm. Wahl, the director of an 

educational establishment for homeless girls in Denmark, who investigated 

this question, found that the increase of weight for all the ages 

investigated was constantly about 33 per cent. greater in the summer 

half-year than in the winter half-year. It was noteworthy that even the 

children who had not reached school-age, and therefore could not be 

influenced by school-life, showed a similar, though slighter, difference 

in the same direction. It is, however, Malling-Hansen, the director of an 

institution for deaf-mutes in Copenhagen, who has most thoroughly 

investigated this matter over a great many years. He finds that there are 

three periods of growth throughout the year, marked off in a fairly sharp 

manner, and that during each of these periods the growth in weight and 

height shows constant characteristics. From about the end of November up 

to about the end of March is a period when growth, both in height and 

weight, proceeds at a medium rate, reaching neither a maximum nor a 

minimum; increase in weight is slight, the increase in height, although 

trifling, preponderating. After this follows a period during which the 

children show a marked increase in height, while increase in weight is 

reduced to a minimum. The children constantly lose in weight during this 

period of growth in height almost as much as they gain in the preceding 

period. This period lasts from March and April to July and August. Then 

follows the third period, which continues until November and December. 

During this period increase in height is very slight, being at its early 

minimum; increase in weight, on the other hand, at the beginning of the 

period (in September and October), is rapid and to the middle of December 

very considerable, daily increase in weight being three times as great as 


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