that is to say, they became to be regarded as "not respectable." Ignorance regarding the plain elementary facts of sexual physiology is undoubtedly the cause not only of much immorality among young people of both sexes, but also of many unhappy and inharmonious marriages. The intelligent portion of our race is now beginning to realize very keenly the fact that the first requisite of sane marital relations and intelligent parenthood is a practical and clear knowledge of the physiology of sex; education concerning the sexual organism, its laws, its functions, its normal and healthy conditions, its anatomy, its physiology and hygiene. The average physician of experience in general or special practice can tell tales of almost incredible ignorance on the part of young women who have recently entered into the relationship of marriage. In some cases the ignorance is more than a mere absence of knowledge--it consists too often of false-knowledge, untruthful ideas concerning matters of the most serious import. It is sad enough to think how such persons may work results harmful to themselves, but it is even sadder still to realize that these same ignorant young women must eventually gain their real knowledge through sad experience--experience paid for not only by themselves but also by their children. It is a hard saying, but a true one, that the knowledge of many young wives and mothers is to be gained by experience paid for by their (as yet) unborn children. The writer of the present work is one of the rapidly growing number of thinking persons who believe that the time has come to educate the race concerning the importance of sane instruction concerning the functions of sex. He, and those who think as he does, believe that the time has come to "Turn on the Light!" They believe that the importance of the subject will be realized by all intelligent persons, once that their attention is directed to the subject, and once they have considered it apart from the old prejudices and distorted customs. When public opinion on this subject is reformed, then will the taboo fall away from the body of truth; then will the subject take its place among the "respectable" topics which may be considered, discussed, and taught, without loss of caste or prestige.