e male ant is small in size when compared with the
female. Nevertheless, in all classes of animals the difference in the
structure and the functions of the sexual organs is the chief
distinguishing character. These differences are not so great, however,
as they might at first appear. The male and female organs of
reproduction in man and other animals, which seem so dissimilar, when
studied in the light shed upon this subject by the science of embryology,
are found to be wonderfully alike in structure, differing far more in
appearance than in reality, and being little more than modifications
of one general plan. Every organ to be found in the one sex has an
analogue in the other which is complete in every particular,
corresponding in function, in structure, and usually in position.

Other Sexual Differences.--In this country there is between five and
six inches difference in height and about twenty pounds difference in
weight between the average man and the average woman, the average man
being about five feet, eight inches in height, and weighing one hundred
and forty-five pounds; while the average woman is five feet, two or
two and one-half inches in height, and weighs one hundred and
twenty-five pounds. The relation of the sexes in height and weight
varies in degree in different countries, but is never changed. The
average height and weight of American men and women is considerably
above that of the average human being.

Men and Women Differ in Form.--The differences in form are so marked
that it is possible for the skilled anatomist to determine the sex of
a human being who has been dead for ages, by an examination of the
skeleton alone. In man, the shoulders are broad, the hips narrow, and
the limbs nearly straight with the body. In woman, the shoulders are
narrow and usually rounded, and set farther back, the collar-bone being
longer and less curved, giving the chest greater prominence; while the
hips are broad.

The consequence of these differences is that woman is generally less
graceful and naturally less skillful in the use of the extremities than
man, and hence less fitted for athletic sports and feats requiring great
dexterity. A girl throws a stone awkwardly, less from want of practice
than from a natural peculiarity of physical structure. A woman walks
less gracefully than a man, owing to the greater relative breadth of
her hips, requiring a motion of the body together with that of the limbs.
In consequen