The mother, not the father, should begin the sex-education of her son. The most effective method of imparting sex-information is by what is called the biological approach. At age seven or eight the foundation for sex-instruction should be laid by information concerning plant production; that the pollen dust of the father plant becomes attached to the legs of the honey-seeking bee and is transferred to the mother plant, where it fertilizes the seed from which a baby plant grows. The function of the wind, also, in effecting the conjunction of pollen with the ovule of the stigma should be explained; and how the pollen or male principle fertilizes and gives life to the female ovule, making seed from which a new plant is born. Now by successive stages and in detail his mind should be directed to the processes of reproduction in the lower forms of animal life, such as fishes, snakes, and frogs; then to the higher forms of life represented in birds and domestic fowl, and then to the still higher form of mammals, and finally to reproduction in the human being, emphasizing its biological and sacred aspects. The wonderful workings of nature should be made predominant in explaining the reproduction of the lower orders of life while the pure and spiritual phase of human reproduction should be stressed. Coincident with the conclusion of such instruction, there should be given a brief explanation of the functions of the generative organs in the process of reproducing the species, the injury of secret vice and the necessity for personal purity. At this first sign of approaching puberty the father should assume the duty of further instruction, which should now advise the boy of the wonderful sexual changes about to take place in his body and the new and powerful desires about to be awakened. The normal development of adolescence should be pointed out and a warning sounded as to the error of mistaking certain natural phenomena for the abnormal. At the age of fifteen to sixteen the necessity arises for admonition against sexual promiscuity and its relationship to the hygienic health of the individual and its eugenic influence on coming generations. During the entire period the note of personal purity should be sounded by a strong appeal to his moral and religious sense. Untold numbers of boys go wrong sexually through ignorance, who would have kept to the paths of purity had they but known.