On the other hand, we have many clinical cases in which after years of impotence from psychic causes the removal of these latter not only restored the procreative function but relieved the patient of often grave symptoms and brought marked mental rejuvenation. This has been often recorded, especially for men. In some instances, apparently, children have been born after such a period of dormancy or latency that has lasted for years. Not only is the downward slope of this curve far more gradual than its pubertal rise and, as we have seen, attended by more oscillations but there is far more individual variation in the age at which decline begins and ends, so that one man’s norm would be another man’s disaster and perhaps doom. The old should be able to think most dispassionately upon such themes and should feel it incumbent upon them to transmit the wisdom born of their own experience and observation to the younger generation. In certain primitive races and modern societies and communities the old, usually of the same but sometimes even of the opposite sex are expected to initiate the members of the rising generation in the mysteries of sex. We now know the dangers and sometimes even incestuous tendencies with which such a course is sure to be beset; and if parents attempt to discharge this function for their children, or wherever it is done personally, there are perils. Indeed, none of the methods of sex education, of which so many have lately been proposed, have been entirely satisfactory. Perhaps this kind of training really ought to be one of the special functions of grandparents and they should prepare themselves for it. At any rate, while we have learned much in recent years of sex psychology, pedagogy, and hygiene for the young, we have almost no literature, and indeed know almost nothing of it for the old; and this despite the fact that they are in the greatest need of it and have practically no help in the solution of the novel and intricate problems they must now face, as best they can, alone.