It is obvious to say that instruction on sex can best be given the child by his parents; they are his natural teachers, possessing the confidence of the child and having the intimate relationship, affection and sympathetic understanding which renders personal instruction effective. But the neglect of this parental duty is so prevalent even among educated parents who are solicitous for their children’s future, that courses of instruction in our grammar and high schools and colleges are now being advocated to supply this parental omission. Indeed, one or more public high schools in our large cities have already added sex-instruction to their course of study, while a number of normal schools and colleges have for some years included it in their curriculums. Such a revolutionary innovation has not been unattended by opposition, chiefly from parents and public school boards, but only rarely from the heads of educational institutions of advanced grades. The introduction of such a course is attended by some impediments, not the least of which is the difficulty of procuring teachers who possess both the tact and the pedagogic knowledge necessary to give instruction on the subject in its biological, hygienic, and ethical aspects in such a manner as will inform and warn the child against the dangers of premature sex excitation and satisfy his curiosity without stimulating his interest. Another difficulty in the way of teaching the subject in public and other schools--even when classes are segregated by sex--is the psychology of the mob, evident in a large group of boys who already are possessed of copious misinformation which tends to a more flippant and prurient reception of the subject than when the information is given privately. This is evident even in advanced schools. One of our greatest institutions of learning has two courses of lectures on sex-hygiene for freshmen and seniors, which are generally referred to by the students as “Smut One” and “Smut Two.” The American Federation for Sex Hygiene is perhaps the leading advocate of the policy of sex-education in graded and high schools, to be given in conformity with a thoughtful and conservative plan which has its basis in biological study. The heads of many prominent colleges and universities have given their indorsement to this plan which is endowed with such elasticity that it may be varied to meet the needs of the differing mental and physical requirements of the young.