While each study is complete in itself, the general thesis running
through all of them is the same--that the differences in bodily
habit between men and women, particularly the greater strength,
restlessness, and motor aptitude of man, and the more stationary
condition of woman, have had an important influence on social forms
and activities, and on the character and mind of the two sexes.

"Organic Differences in the Sexes" appeared in the _American Journal
of Sociology_, III, 31ff., with the title, "On a Difference in the
Metabolism of the Sexes;" "Sex and Primitive Social Control," _ibid._,
III, 754ff.; "Sex and Primitive Industry," _ibid._, IV, 474ff.; "Sex
and Primitive Morality," _ibid._, IV, 774ff.; "The Psychology of
Modesty and Clothing," _ibid._, V, 246ff.; "The Adventitious Character
of Woman," _ibid._, XII, 32ff.; "The Mind of Woman and the Lower
Races," _ibid._, XII, 435ff.; "The Psychology of Exogamy," in the
_Zeitschrift für Socialwissenschaft_, V, 1ff., with the title,
"Der Ursprung der Exogamie;" "Sex and Social Feeling," in the
_Psychological Review_, XI, 61ff., with the title, "The Sexual
Element in Sensibility." Portions of a paper printed in the _Forum_,
XXXVI, 305ff., with the title, "Is the Human Brain Stationary?"
are incorporated in the paper on "The Mind of Woman and the Lower
Races," and portions of a paper printed in the _American Journal
of Sociology_, IX, 593ff., with the title, "The Psychology of
Race-Prejudice," are incorporated in the paper on "Sex and Social
Feeling." I acknowledge the courtesy of the editors of these journals
for permission to reprint.

W.I.T.