_To the daughters of my friends, but especially to MARY LOUISE this little book is lovingly dedicated._ No one can come in contact with children and young people without feeling the need of a united effort on the part of the parents, physicians and teachers to lessen the immoral tendencies, with their degrading effects, to which the present generation is subjected. Knowledge of the right sort will prevent many wrecked lives. Ignorance as to facts and to the best manner of presenting them prevents many a parent from daring to trespass upon such sacred ground, and the instruction is postponed from day to day until it is too late.…
Or read it translated: 日本語 · 中文 · हिन्दी · Español · العربية · Français · বাংলা · Português · Русский · Bahasa Indonesia · اردو · Deutsch · Kiswahili · 한국어