=Parents as instructors.=--The second adverse opinion is that the necessary instruction on these subjects should be given to children and young persons by their parents and by them alone. This opinion is sound to this extent, that in cultivated and refined families, in which the parents possess sufficient knowledge of the whole subject, the needed instruction will best come to the children through the mother and the father, beginning at a tender age. All children ask questions on this subject. Their curiosity is roused early, and is usually very pointedly expressed. The asking of questions should invariably be the mother’s precious opportunity to describe to the child, with delicacy and reserve, but truthfully, the mother’s part in the production of the human infant. By so doing, the mother will establish a new bond between herself and child, and will acquire a strong claim on its abiding affection. Every father competent for the task should see that his boys understand the natural and wholesome process of reproduction, and the great physical dangers which accompany violations of the moral law in this respect. He should see that they know that continence is absolutely healthy, and, indeed, is indispensable to the highest attainment in bodily strength and endurance. He should make sure that his boys understand what honor requires of a man in his relation to women, and that chastity is just as admirable and feasible in a man as in a woman, and just as necessary for the protection of family life and the eradication of the very worst evils which now degrade and poison civilized society. It is quite true that all this instruction will come best, whenever possible, from loving fathers and mothers to their own offspring; because it will then be given intimately, privately, and with tenderness and purity. Inasmuch, however, as the great majority of parents do not now possess the necessary knowledge, or the faculty of expression necessary for imparting it, and there are many families that have lost father, mother, or both, society must for the present rely in the main on the schools to give this instruction, which is, indeed, indispensable for the salvation of civilization. =School can teach nature’s sex laws.=--It is, however, a very serious problem, how to give the needed instruction in sex hygiene in all the schools, public, private, and endowed. No one is competent to-day to lay down a fixed and final program. The programs for this subject must be experimental or tentative for many years to come. All that can be done at present is to indicate the general lines of the promising experiments on this difficult subject. Innumerable experimenters must in time work out the details with insight, patience, and skill. The general lines may, however, be laid down with a reasonable degree of confidence. They are as follows: