from a mere sexual education of the boys. From a psychological point of view, this situation appears much more difficult than that of the girls. All psychological motives speak for a policy of silence in the girls' cases. For the boys, on the other hand, the importance of some hygienic instruction cannot be denied. A knowledge of the disastrous consequences of sexual diseases must have a certain influence for good, and the grave difficulty lies only in the fact that nevertheless all the arguments which speak against the sexual education of the girls hold for the boys, too. The harm to the youthful imagination, the starting of erotic thoughts with sensual excitement in consequence of any kind of sexual instruction must be still greater for the young man than for the young woman, as he is more easily able to satisfy his desires. We must thus undoubtedly expect most evil consequences from the instruction of the boys; and yet we cannot deny the possible advantages. Their hygienic consciousness may be enriched and their moral consciousness tainted by the same hour of well-meant instruction. With the girls an energetic no is the only sane answer; with the boys the social reformer may well hesitate between the no and the yes. The balance between fear and hope may be very even there. Yet, however depressing such a decision may be, the psychologist must acknowledge that even here the loss by frank discussion is greater than the gain. A serious warning lies in the well-known fact that of all professional students, the young medical men have the worst reputation for their reckless indulgence in an erotic life. They know most, and it is psychologically not surprising that just on that account they are most reckless. The instinctive fear of the half knower has left them; they live in an illusory safety, the danger has become familiar to them, and they deceive themselves with the idea that the particular case is harmless. If the steps to be taken were to be worked out at the writing desk in cool mood and sober deliberation, the knowledge would at least often be a certain help, but when the passionate desire has taken hold of the mind and the organic tension of the irritated body works on the mind, there is no longer a fair fight with those sober reasons. The action of the glands controls the psychophysical reactions, so that the ideas which would lead to opposite response are inhibited. Alcohol and the imitative mood of social gayety may help to dull those hygienic fears, but on the whole the mere sexual longing is sufficient to break down the reminiscence of medical warning. The situation for the boy is then ultimately this: A full knowledge of the chances of disease will start in hours of sexual coolness on the one side a certain resolution to abstain from sexual intercourse, and on the other side a certain intention to use protective means for the prevention of venereal diseases. As soon as the sexual desire awakes,