remember that the great majority of physicians and other scientific investigators who have studied such problems refuse to believe that repressed sex instincts in either men or women do the harm that a few extremists have claimed. But even if it were known beyond the shadow of a doubt that repressed sex instincts may injure people, it would be unwise to intrust young people to instruction by teachers who have a hypochondriacal interest in such a doctrine of repression. Such suggestions can do only harm to the vast majority of persons who receive them. To say the least, it is unfortunate that the psychopathology of sex has become so widely circulated among those who are not well trained in physiology and psychiatry. [Sidenote: Teachers who emphasize sexual abnormality.] The third kind of people who should not be intrusted with teaching sex-hygiene are the men and women who, without a scientific perspective, have plunged into the literature of sexual abnormality until they have come to think that knowledge concerning perverted life is an important part of sex-education for young people, especially for those of post-adolescent years. I know of teachers and physicians who advise young people not much over twenty years of age to read such psychopathological works as those of Krafft-Ebing, Ellis, and Freud, and various works dealing with commercialized vice. Here is a grave danger. The less that people without professional use for knowledge of sexual pathology know concerning it, the better it will be for their peace of mind and possibly for their morals. Therefore, I urge that he who enthusiastically studies the abnormalities of sex life without reference to scientific research or professional demands, is not likely to be the kind of teacher who will present abnormal life only so far as is necessary to an understanding of the perfectly normal. [Sidenote: Pessimistic teachers.] The fourth kind of people who ought not to instruct the young in personal problems of sex-hygiene are the men and women whose own unhappy romances or married life, or whose knowledge of vice conditions, have made them pessimistic concerning sex-problems. There are in our schools and colleges to-day some such men and many such women, and there will be danger for young people when the growing freedom of expression allows these sexual pessimists to impress their own hopeless philosophy of sex upon students. The educational world does not need such teachers, but rather those who can follow the late Dr. Morrow in seeing a bright side of life that almost dispels the darkness of sexual errors. [Sidenote: Teachers not respected by pupils.]