Nurture Necessary as Well as Breed--Precocious Manifestations of the Sexual Impulse--Are They to be Regarded as Normal?--The Sexual Play of Children--The Emotion of Love in Childhood--Are Town Children More Precocious Sexually Than Country Children?--Children's Ideas Concerning the Origin of Babies--Need for Beginning the Sexual Education of Children in Early Years--The Importance of Early Training in Responsibility--Evil of the Old Doctrine of Silence in Matters of Sex--The Evil Magnified When Applied to Girls--The Mother the Natural and Best Teacher--The Morbid Influence of Artificial Mystery in Sex Matters--Books on Sexual Enlightenment of the Young--Nature of the Mother's Task--Sexual Education in the School--The Value of Botany--Zoölogy--Sexual Education After Puberty--The Necessity of Counteracting Quack Literature--Danger of Neglecting to Prepare for the First Onset of Menstruation--The Right Attitude Towards Woman's Sexual Life--The Vital Necessity of the Hygiene of Menstruation During Adolescence--Such Hygiene Compatible with the Educational and Social Equality of the Sexes--The Invalidism of Women Mainly Due to Hygienic Neglect--Good Influence of Physical Training on Women and Bad Influence of Athletics--The Evils of Emotional Suppression--Need of Teaching the Dignity of Sex--Influence of These Factors on a Woman's Fate in Marriage--Lectures and Addresses on Sexual Hygiene--The Doctor's Part in Sexual Education--Pubertal Initiation Into the Ideal World--The Place of the Religious and Ethical Teacher--The Initiation Rites of Savages Into Manhood and Womanhood--The Sexual Influence of Literature--The Sexual Influence of Art. It may seem to some that in attaching weight to the ancestry, the parentage, the conception, the gestation, even the first infancy, of the child we are wandering away from the sphere of the psychology of sex. That is far from being the case. We are, on the contrary, going to the root of sex. All our growing knowledge tends to show that, equally with his physical nature, the child's psychic nature is based on breed and nurture, on the quality of the stocks he belongs to, and on the care taken at the early moments when care counts for most, to preserve the fine quality of those stocks.