To offset this increasing social danger sex instruction is an insistent necessity. Boys and girls must be taught to see themselves as members of society with all that that implies. To do so means a knowledge of self and sex and their functions and responsibilities. The sources and processes of life must be intelligently understood and thus respected. Ignorance of life does not beget purity, respect and honor. A boy's regard for a girl cannot proceed from lack of knowledge, although this lack may be termed innocence. A girl's love for the best for self and others is impossible unless she has knowledge tinged with the awe of God's purposes. Too often have our boys and girls been merely innocent, such innocence causing their fall. The tree of knowledge sometimes demands a high price for its fruit. To safeguard lives unblighted, the purity and processes of life's mystery must be imparted through instruction to our growing youth. This can best be done by the parents--father or mother--for since children (boys or girls) ripen and come to puberty, individually and independently, the parent is God's choice for this task. To group boys and girls together for this instruction is terribly wrong, as the group must contain those whose need for information varies. To talk on these matters in mixed groups of boys and girls is to incite wrong impulses and is criminal. The parent is God's instructor in these things--a father to the son and a mother to the daughter. Anything else is second or third best and only to be done under great necessity. Under unusual conditions a _Christian physician_ may instruct small groups of like physiological age, but the parental way is best, because it is both natural and permanent and we seek both. =Sunday School and Sex= Parents must be trained for this high duty. To this end Fathers' and Mothers' Meetings should be promoted separately by the Sunday school. Not one merely but a series, so that every father and mother may be able to attend. It would be well to promote these in small groups by invitation and acceptance until every father and mother was reached. A regular course of education might be arranged, viz.: First Lecture--How to meet the questions of children. Second Lecture--How to prepare the boy and girl for the understanding of puberty. Third Lecture--Adolescence: The Physiology and Anatomy of the Sex Organs and Methods of Sex Instruction. Fourth Lecture--Hygiene: Personal, Public, Home, School and Church. These might be preceded by an address on the conditions that today make the above necessary; such might be a Sunday evening sermon or week-night address by the pastor of the church. The lectures should be delivered and instruction given by a _Christian Physician_. Meetings should be held for fathers by themselves and for mothers likewise; however, in either or both meetings the whole field--boys and girls--should be discussed.