2. In the anamnesis of many cases of anxiety neurosis we find in both men and women a striking fluctuation in the intensity of the appearances in both the coming and going of the whole condition. This year was almost wholly good, the following was terrible, etc.; on one occasion the improvement occurred after a definite treatment which, however, failed to produce a response at the next attack. If we inform ourselves about the number and the sequence of the children, and compare this marriage chronicle with the peculiar course of the neurosis, the result of the simple solution shows that the periods of improvement or well being corresponded with the pregnancies of the woman during which, naturally, the occasions for preventive relations were unnecessary. The treatment which benefited the husband, be it Father Kneip’s or the hydrotherapeutic institute, was the one which he has taken after he found his wife was pregnant. 3. From the anamnesis of the patients we often find that the symptoms of the anxiety neurosis are relieved at a certain time by another neurosis, perhaps a neurasthenia which has supplanted it. It can then be regularly demonstrated that shortly before this change of the picture there occurred a corresponding change in the form of a sexual injury. Whereas such experiences, which can be augmented at pleasure, plainly obtrude upon the physician the sexual etiology for a certain category of cases, other cases which would have otherwise remained incomprehensible can at least without gainsaying be solved and classified by the key of the sexual etiology. We refer to those numerous cases in which everything exists that has been found in the former category, such as the appearance of anxiety neurosis on the one hand, and the specific moment of the coitus interruptus on the other, but yet something else slips in, namely, a long interval between the assumed etiology and its effect, and perhaps other etiological moments of a non-sexual nature. We have here, for example, a man who was seized with an attack of palpitation on hearing of his father’s death, and who since that time suffered from an anxiety neurosis. The case cannot be understood, for up to that time this man was not nervous. The death of the father, well advanced in years, did not occur under any peculiar circumstances, and it must be admitted that the natural expected death of an aged father does not belong to those experiences which are wont to make a healthy adult sick. The etiological analysis will perhaps seem clearer if I add that out of regard for his wife this man practiced coitus interruptus for eleven years. At all events the manifestations are precisely the same as those appearing in other persons after a short sexual injury of this nature, and without the intervention of another trauma. The same judgment may be pronounced in the case of a woman who merges into an anxiety neurosis after the death of her child, or in the case of the