The foregoing physiological law is a truth full of hope and promise of infinite progress, for nations have hitherto perished in large measure through the abuse and degradation of women. The regulation of sexual intercourse in the best interests of womanhood is the hitherto unrecognised truth of Christianity, towards which we are slowly groping. When it is fully accepted, a fresh spring of vigour will have been discovered for the human race. APPENDIX II. (PAGE 32) The following sound advice on sexual physiology from the _Lancet_ should be widely known: ‘Young men in their conflict with temptation to sexual advice often suffer under the disadvantage of receiving but little help from those to whom they ought to look for it with confidence. Few parents have the knowledge and the wisdom to tell their sons the most important truths about the sexual passion just at the time when it is becoming developed in them, and the latter are therefore left an easy prey to their strange desires, and to those “lewd fellows of the baser sort” who are always at hand to corrupt innocent youth. ‘If it is true that to a very large extent parents are unmindful of one of their gravest responsibilities, it is no less true that the medical profession has often failed in its duty in connection with this subject. Medical writers and medical men generally are too often silent on this matter, and unfortunately, when the silence has been broken, it has not always been with words of truth and soberness. We are constantly hearing and saying that “knowledge is power,” yet we find that little effort is made to impart the knowledge which would largely aid in preserving the virtue of the young, and the most pernicious teaching of those who for the lowest of reasons propagate error is left unnoticed.