dds greatly
to the interest and value of the work, as there seemed to be a slight
deficiency in this particular in the former editions.

J. H. K.
BATTLE CREEK, MICH.,
_October, 1879_.

CONTENTS.

PAGE.
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

_SEX IN LIVING FORMS_.

Living beings--Animals and vegetables--Life force--Reproduction--
Spontaneous generation--Simplest form of generation--Hermaphrodism--
Sex in plants--Sex in animals--Other sexual differences--Men and women
differ in form--Modern mania for female pedestrianism--3,000 quarter
miles in 3,000 quarter hours--A female walking-match--The male and
female brain--Vital organs of man and woman--Woman less muscular,
more enduring--A pathological difference--Why a woman does not
breathe like a man--The reproductive elements--Sexual organs of plants--
Polygamous flowers--The female organ of flowers--Sexual organs of
animals--The spermatozoon--The ovum--Fecundation--Fecundation in
flowers--Union of the ovum and zoosperm--Curious modes of
reproduction--Human beings are developed buds--Fecundation in
hermaphrodites--Development--Unprotected development--Partial
protection of the ovum--Development in the higher animals and in man--
The uterus--Uterine gestation--The primitive trace--Curious relations to
lower animals--Simplicity of early structures--The stages of growth--
Duration of gestation--Uterine life--How the unborn infant breathes--
Parturition--Changes in the child at birth--Nursing--Anatomy of the
reproductive organs--Male organs--The prostate gland--Female organs--
Puberty--Influence of diet on puberty--Brunettes naturally precocious--
Remarkable precocity--Premature development occasions early decay--
Early puberty a cause for anxiety--Changes which occur at puberty--
Menstruation--Nature of menstruation--A critical period--Important
hints--Menorrhagia--Dysmenorrhoea--Amenorrhoea and chlorosis--
Hysteria--Prevention better than cure--Extra-uterine pregnancy--Twins--
Monsters--Hybrids--Law of sex--Heredity--Ante-natal influences--Law
universal--A source of crime--Circumcision--Castration . . . . . . . 25

_THE SEXUAL RELATIONS_.

Sexual precocity--Astonishing ignorance--Inherited passion--Various
causes of sexual precocity--Senile sexuality--Marriage--Time to
marry--Application of the law of heredity--Early marriage--Mutual
adaptation--Disparity o