Victims of all Ages.--The ages at which the habit may be practiced include almost the whole extent of human life. We have seen it in infants of only three or four years, and in old men scarcely less than sixty, in both extremes marked by the most unmistakable and lamentable consequences. Cases have been noted in which the practice was begun as early as two years of age. It is common among African boys at nine and ten years of age, according to Dr. Copland. Unsuspected Rottenness.--Parents who have no suspicion of the evil, who think their children the embodiment of purity, will find by careful observation and inquiry,--though personal testimony cannot be relied upon,--that in numerous instances their supposed virtuous children are old in corruption. Such a revelation has brought dismay into many a family, only too late in some cases. Not long since a case came under our care which well illustrates the apathy and blindness of parents with respect to this subject. The parents of a young man whose mind seemed to be somewhat disordered, sent word to us through a friend respecting his condition, asking advice. We suspected from the symptoms described the real cause of the disease, and urged prompt attention to the case. In a short time the young man was placed under our immediate care without encouragement of a cure, and we gave the case still closer study. The characteristic symptoms of disease from self-abuse were marked, but the father was positive that no influence of that kind could have been at work. He had watched his son narrowly from infancy, and did not believe it possible for him to have been guilty. In addition, the young man had long been remarkable for his piety, and he did not believe there could be any possibility of his being guilty of so gross a crime. A short time sufficed, however, to secure the indisputable evidence of the fact by his being caught in the act by his nurse.