Hein replied that abstinence is harmless for most, but in some leads to hysterical manifestations and indirectly to bad results from masturbation, while for the normal man abstinence cannot be directly beneficial, since intercourse is natural. Grützner thought that abstinence is almost never harmful. Nescheda said it is harmless in itself, but harmful in so far as it leads to unnatural modes of gratification. Neisser believes that more prolonged abstinence than is now usual would be beneficial, but admitted the sexual excitations of our civilization; he added that of course he saw no harm for healthy men in intercourse. Hoche replied that abstinence is quite harmless in normal persons, but not always so in abnormal persons. Weber thought it had a useful influence in increasing will-power. Tarnowsky said it is good in early manhood, but likely to be unfavorable after twenty-five. Orlow replied that, especially in youth, it is harmless, and a man should be as chaste as his wife. Popow said that abstinence is good at all ages and preserves the energy. Blumenau said that in adult age abstinence is neither normal nor beneficial, and generally leads to masturbation, though not generally to nervous disorders; but that even masturbation is better than syphilis. Tschiriew saw no harm in abstinence up to thirty, and thought sexual weakness more likely to follow excess than abstinence. Tschish regarded abstinence as beneficial rather than harmful up to twenty-five or twenty-eight, but thought it difficult to decide after that age when nervous alterations seem to be caused. Darkschewitcz regarded abstinence as harmless up to twenty-five. Fränkel said it was harmless for most, but that for a considerable proportion of people intercourse is a necessity. Erb's opinion is regarded by Jacobsohn as standing alone; he placed the age below which abstinence is harmless at twenty; after that age he regarded it as injurious to health, seriously impeding work and capacity, while in neurotic persons it leads to still more serious results. Jacobsohn concludes that the general opinion of those answering the inquiry may thus be expressed: "Youth should be abstinent. Abstinence can in no way injure them; on the contrary, it is beneficial. If our young people will remain abstinent and avoid extra-conjugal intercourse they will maintain a high ideal of love and preserve themselves from venereal diseases."