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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

desire is present throughout the year, only conceive in spring and in 

autumn. Almost any time of the year may be an animal's pairing season, 

this season being apparently in part determined by the economic conditions 

which will prevail at birth. While it is essential that animals should be 

born during the season of greatest abundance, it is equally essential that 

pairing, which involves great expenditure of energy, should also take 

place at a season of maximum physical vigor. 

 

As an example of the sexual history of an animal through the 

year, I may quote the following description, by Dr. A.W. 

Johnstone, of the habits of the American deer: "Our common 

American deer, in winter-time, is half-starved for lack of 

vegetation in the woods; the low temperature, snow, and ice, make 

his conditions of life harder for lack of the proper amount of 

food, whereby he becomes an easier prey to carnivorous animals. 

He has difficulty even in preserving life. In spring he sheds his 

winter coat, and is provided with a suit of lighter hair, and 

while this is going on the male grows antlers for defence. The 

female about this time is far along in pregnancy, and when the 

antlers are fully grown she drops the fawn. When the fawns are 

dropped vegetation is plentiful and lactation sets in. During 

this time the male is kept fully employed in getting food and 

guarding his more or less helpless family. As the season advances 

the vegetation increases and the fawn begins to eat grass. When 

the summer heat commences the little streams begin to dry up, and 

the animal once more has difficulty in supporting life because of 

the enervating heat, the effect of drought on the vegetation, and 

the distance which has to be traveled to get water; therefore, 

fully ten months in each year the deer has all he can do to live 

without extra exertion incident to rutting. Soon after the autumn 

rains commence vegetation becomes more luxurious, the antlers of 

the male and new suits of hair for both are fully grown, heat of 

the summer is gone, food and drink are plentiful everywhere, the 

fawns are weaned, and both sexes are in the very finest 

condition. Then, and then only, in the whole year, comes the rut, 

which, to them as to most other animals, means an unwonted amount 

of physical exercise besides the everyday runs for life from 

their natural enemies, and an unusual amount of energy is used 

up. If a doe dislikes the attention of a special buck, miles of 

racing result. If jealous males meet, furious battles take place. 

The strain on both sexes could not possibly be endured at any 

other season of the year. With approach of cold weather, climatic 

deprivations and winter dangers commence and rut closes. In all 

wild animals, rut occurs only when the climatic and other 

conditions favor the highest physical development. This law holds 

good in all wild birds, for it is then only that they can stand 

the strain incident to love-making. The common American crow is a 

very good study. In the winter he travels around the ricefields 

of the South, leading a tramp's existence in a country foreign to 

him, and to which he goes only to escape the rigors of the 

northern climate. For several weeks in the spring he goes about 

the fields, gathering up the worms and grubs. After his long 


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